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Courtney Gains -- who starred as psychotic teenage killer Malachai in "Children of the Corn" -- is allegedly wreaking havoc in his real life too ... his ex-girlfriend obtained a restraining order against the guy claiming he's threatening her life.

Kelley Marie Pospisil -- who says she dated Gains for 2 years --filed court documents begging the judge to keep the 46-year-old actor at least 100 yards away from her at all times.

In the docs ... Kelley says Gains has been sending her threatening text messages since they broke up ... writing things like "Don't think I won't go find your ass. Just keep it up b**ch."

K.M.P. says Gains is using Facebook to track her down through her friends ... and fears "his escalating behavior is going to get worse." She also claims Gains confessed to her that he was abusive towards past girlfriends.

Kelley states, "I am scared that [Gains] may be following me or stalking me ... [his] behavior is terrifying and making me fearful of my life."

We reached out to Gains for comment -- but no luck.

It's been almost two years since "The Social Network" came out, but Jesse Eisenberg is somehow still being mistaken for Facebook founder Mark Zuckerberg ... even at the Olympics!

During the telecast of the men's basketball gold medal game, the camera cut to Eisenberg in the crowd. The announcer, Bob Fitzgerald, tried to make a joke of it, saying, "I know I'm gonna put that picture on Facebook. We've got every executive of note, it seems worldwide, attending these Games."

A photo of a topless Mark Zuckerberg is burning up the Internet right now ... immediately fueling suspicions of a major Facebook privacy screw-up.

It's unclear when or where the pic was taken ... showing the kid billionaire sans shirt with a couple of male friends. Mark's in pretty good shape for a computer nerd.

Now for the conspiracy theory ...

The image surfaced on the image-sharing site imgur ... along with a photo caption that appears to explain how the anonymous poster got a hold of the shot in the first place.

The poster claims the pic was "accidentally posted" by Facebook Director of Engineering Andrew Bosworth ... who also appears in the pic on the far right.

The poster claims Bosworth deleted the pic "seconds later" ... but it was too late, someone captured the image and splashed it to the web.

If so, it would be another black eye for the social network ... which is still trying to recover from its epically poor performance on the stock market.

We've reached out to Facebook -- so far, no comment.

Selena Gomez has been banned from Facebook until further notice -- but here's the thing ... it's not the famous Selena Gomez ... it's a girl in New Mexico with the same name ... and she's PISSED.

18-year-old Selena MIRANDA Gomez tells TMZ, she tried to sign in to her Facebook account on Wednesday ... but was denied, receiving a message instead that her account had been disabled for being "inauthentic."

According to the error message, the account was disabled for violating Facebook's terms -- which state, "Impersonating anyone or anything is not allowed."

But clearly, the non-famous Selena isn't impersonating anyone -- and now she's really upset that she's been unfairly banned from her social networking profile, telling TMZ, "I AM NOT AN IMPOSTOR ... My name is not hers on my page. In fact, I even put my middle name on my FB to clear up any confusion."

She says, "I did not have one single famous friend. I did not refer to myself as [the famous Selena], and I did not have any pictures of her on my page!"

Selena says she's reached out to FB to reactivate her account -- but so far, no luck.

A new lawsuit claims Mark Zuckerberg pulled a billion dollar fast one on Facebook investors.

The class action lawsuit -- filed by disgruntled Facebook shareholders -- claims the 28-year-old CEO had inside info that the stock was grossly overvalued, and he protected his own financial hide by quickly unloading a ton of Facebook stock.

This is the second time in two weeks a group of FB shareholders have joined together to accuse the mogul of withholding information.

The lawsuit claims Zuckerberg and his cronies hid the fact that there was a foundational flaw in the Facebook business model -- that there was not nearly enough advertising revenue to support a stock valued at $38 a share.

The lawsuit claims Morgan Stanley, JPMorgan, and Goldman Sachs -- all sounded the alarm before the IPO that Facebook was seriously overvalued, but that information was "selectively disclosed" to the largest investors.

Mark Zuckerberg ditched his hoodie for a more grown up, married look ... as he and Priscilla Chan strolled on a cobblestone road on the Amalfi Coast in Italy.

It's the second leg of their honeymoon -- they just left Rome.

Good to see Mark smiling, in spite of the fact that his fortune sank from $20 billion to around $17 billion.

Mark Zuckerberg and Priscilla Chan blended with the crowd during their honeymoon in Rome -- as best as a gazillionaire can blend.

It looks like they didn't attract much attention -- in fact, they seem to go unnoticed by most people in the crowded restaurant in the middle of the famed city.

In a roundabout way ... Mark Zuckerberg saved Zsa Zsa Gabor and hubby Prince Frederic von Anhalt from foreclosure.

Zsa Zsa and von A-hole were slated to lose their mansion at month's end because of a $700,000 mortgage that was in default.

Von A-hole tells us ... in a last-ditch effort to save the homestead, he jumped on Facebook and begged his fans for help. Shockingly, his prayers were answered. Even more shocking, he has fans.

Someone stepped up and helped von A-hole secure a $1.5 million personal loan -- which he used to pay off the mortgage.

But there's a catch -- Von A-hole has ONE YEAR to pay back the loan ... a loan which we understand is secured by the house.

Mark Zuckerberg's freshly-minted wife, Priscilla Chan, evokes a lot of interest but not much action ... according to the shop where she bought her wedding dress.

Cate Malone, the owner of the Little White Dress shop in Denver, CO, tells us the store has been buzzing with curious customers who have been trying on the $4,700 Claire Pettibone gown Priscilla wore at her surprise wedding.

In fact ... traffic on the shop's website has gone up a whopping 680% since the nuptials.

But here's the bottom line -- it's a big fat zero, because no one has bought the dress.

Priscilla Chan is no dummy ... in fact, Mrs. Zuckerberg was voted "Class Genius" back in high school ... way before she decided to hook up with a guy who would change the world.

Chan -- now 27 years old -- received the title during her days at Quincy High School in Massachusetts back in 2003. Priscilla went on to Harvard, where she met Mark and the rest is, as they say ... on her Facebook timeline.

The lesson here: Stay in school, study hard and you too may land a billionaire.

If Mark Zuckerberg's new wife was expecting a MASSIVE diamond on her wedding ring ... she was SORELY disappointed.

Just days after the surprise wedding of the century, Priscilla Chan-Zuckerberg took her brand new ruby rock on the road ... flashing her piece during a lunch date with a friend in Palo Alto, CA yesterday.

According to reports, the $20 BILLION Facebook honcho -- who has a reputation for not caring about excessive displays of wealth -- designed the ring himself.

So, we gotta ask ...

There's talk that Mark Zuckerberg timed his wedding to cut his new wife out of the $20 billion he raked in Friday, when Facebook went public, but it's simply not the case.

As you know, Mark married Priscilla Chan the day after his portfolio ballooned. But here's the deal ... Under California law, if one person grows a business before marriage and sells it right at the time he or she gets hitched, the new spouse has no legal claim to the proceeds of the sale.

Disso Queen Laura Wasser, who reps almost every celeb in the throes of divorce including Britney Spears, Angelina Jolie and Maria Shriver, tells TMZ it's pretty simple: "Facebook is a separate property asset of Mr. Zuckerberg. It's like a painter who paints a painting prior to marriage and sells it shortly after marriage. Any proceeds from the sale of the painting are the artist's separate property."

Now, if Facebook continues to increase in value during their marriage, Priscilla would have a 50% interest in proceeds from the growth. But if today is any indication ... Priscilla shouldn't hold her breath -- the stock plummeted 10% today.

Tough morning for The Zuck -- after a lackluster debut ... Facebook stock is sinking like a stone this morning ... down more than 11% from its opening price.

As of 7:32 AM PDT ... FB had fallen to $33.97 per share ... down $4.26 from its closing price on Friday.

According to MSN.com, the stock was down as much as 14% earlier in the morning.

FYI -- Facebook debuted at $38-per-share ... and many hoped it would explode. It didn't.

Of course, we're still a long way from the closing bell ... and a lot could happen -- good or bad.

Mark Zuckerberg might have more money than the average man, but he has the same musical tastes as everyone else -- because TMZ has learned his wedding was bumping some serious Michael Jackson tracks all night long.

A neighbor of the Facebook CEO tells TMZ ... they could hear the music coming from the wedding the entire time (as evidenced by our video where you can hear Billie Joe Armstrong singing from the street).

The neighbor tells TMZ there was plenty of upbeat music all night -- including Flo Rida, Bon Jovi and Janet Jackson. But the overwhelming favorite was the King of Pop himself, Michael Jackson.

Billie Joe Armstrong performed a touching love song at the wedding of Facebook CEO Mark Zuckerberg yesterday -- which was captured gloriously in this video ... shot from outside the wedding and through some bushes and you can't actually SEE anyone. Ah, romance!

Zuckerberg and longtime girlfriend Priscilla Chan tied the knot yesterday and Zuckerberg's home in Palo Alto, CA. The couple had been dating for nine years.

Facebook founder and CEO Mark Zuckerberg capped off a busy week by getting married today to longtime girlfriend Priscilla Chan.

The couple, who met at Harvard and have been together for nine years, tied the knot in a small ceremony at Zuckerberg's house in Palo Alto, Calif.

Chan, 27, has been busy this week too -- she graduated from medical school at the University of California, San Francisco on Monday.

A company spokeswoman said the ring featuring "a very simple ruby" that Zuckerberg designed himself.