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So this what it looks like to make $20 BILLION in one day.

28-year-old Facebook founder Mark Zuckerberg surfaced moments ago outside his home in Palo Alto, CA -- just hours after his Facebook IPO earned him an extra $20 billion -- and he looked happier (and richer) than ever.

But everyone else wasn't so lucky -- Facebook's stock was originally priced at $38 and finished the day at $38.23 ... not bad, but not great either.

Looks like Paul McCartney's title as world's richest entertainer is safe ... 'cause Bono says his stake in Facebook will NOT push him into the number one spot.

Bono was in D.C. this morning to attend a fundraiser for President Obama ... when a Washington Times photog asked about reports that the U2 frontman's $90 million investment into Mark Zuckerberg's social network will be worth $1.5 billion by the end of the day ... making him the richest rocker on Earth.

FYI -- It's been widely reported that Bono's investment company, Elevation Partners, bought up 2.3% of the company in 2009.

But Bono didn't appear too stoked about it ... in fact, he cast doubt on the entire story.

That ... or maybe he's just trying to be modest.

Here's hoping you enjoyed your soggy-ass cereal this morning -- because the people over at Facebook are celebrating their big IPO day ... by dining on cran-orange scones, coconut mango smoothies, and sausage hash.

It's all being offered at one of the cafes located at Facebook headquarters in Menlo Park, CA -- where FB staffers dine for free -- and the complimentary menu is claw-your-own-eyes-out delicious.

Here's a full breakdown:

Strawberry banana soy smoothies, coconut mango smoothies, whole wheat cranberry orange scones, sausage and biscuit hash with cream gravy, whole wheat choco-chip pancakes with vanilla whipped cream, whole wheat low fat flax waffles, and old-fashioned buttermilk pancakes.

Most of you have already killed yourselves by now, so we'll stop there.

Bono will no longer breathe Paul McCartney's fumes in the money department ... by the close of trading today, he will become the richest rocker in the world, courtesy of Mark Zuckerberg and company.

Bono owns 2.3 percent of Facebook shares, through his investment group, Elevation Partners. The investment will be worth an estimated $1.5 billion by 4 PM ET -- not bad for a $90 million investment back in 2009.

McCartney's fortune is estimated at just a skosh over $1 billion, so Bono will be leaving the surviving Beatle in the dust.

The legal losing streak continues for Cameron and Tyler Winklevoss ... who've been ordered to pay their former lawyers $13 MILLION in fees after losing yet another appeal in their neverending Facebook saga.

The Winklevii have been at war with Quinn Emanuel Urquhart & Sullivan -- the firm that represented them in the case portrayed in "The Social Network." The boys claim the firm committed malpractice by leaking information about their $65 million settlement with Mark Zuckerberg ... and they shouldn't have to pay them a single cent.

But an arbitration panel ruled against the twins ... so they took the case all the way up to a New York appeals court ... which just dished out some more bad news for the Winks ... they lost

Now, the Winklevii have no choice but to pay the fee ... or else the firm can take steps towards seizing their assets.

There is a MAJOR Rebecca Black crisis on Facebook -- with allegations of deception, identity theft ... and most importantly a smoking hot bikini model ... who happens to be named Rebecca Black.

Turns out, there's more than one person on Earth named Rebecca Black -- one of whom is a self-described, "fitness bikini competitor." And she has the photos to prove it.

Black (bikini) tells TMZ ... sometime in the past week, her friend list on Facebook exploded from 800 friends to 73,000 ... and she had no idea how it happened. Black started getting emails from upset fans of the singer -- accusing her of intentionally hijacking the 14-year-old's page ... but Black (bikini) claims she never tried to steal anyone's identity.

Black (bikini) insists Facebook is to blame for somehow "merging" her account with Black's (singer) without her permission.

We called Facebook for comment -- so far no word back.

He may be worth billions, but Facebook CEO Mark Zuckerberg wasn't above cleaning up after his dog Beast's poop in Palo Alto this weekend.

Believe it or not, there is someone Mark still takes crap from.

Timberlake has not revealed how much he's invested in the company -- which News Corp. sold off today for somewhere between $30-40 million.

According to the official announcement, Justin -- who starred in "The Social Network" -- will "play a major role in developing the creative direction and strategy for [MySpace] moving forward."

JT released his own statement -- saying, "There’s a need for a place where fans can go to interact with their favorite entertainers, listen to music, watch videos, share and discover cool stuff and just connect ... MySpace has the potential to be that place."

The Winklevi have been fighting Zuckerberg for 7 years, claiming he jacked their idea for a social network.

The Twins claim Zuckerberg actually screwed them twice -- the second time by hiding documents that could have scored them more than the $65 mil they settled for back in 2008.

The W.T.'s were trying to get a judge to invalidate the settlement so they could renew their fight for more money, but after a series of legal setbacks, they have now officially dropped the case.

According to the final court filing today, the Cameron and Tyler Winklevoss agreed to accept the settlement of $65 million in stock.

Now here's the good news for The Twins. The stock has now swelled in value to $100 million.

The rant -- aimed at "haters" who posted negative comments on the rapper's Facebook page -- included the lines, "IM TIRED OF WHITE PEOPLE DOING US LIKE THIS MAN!! THEY TREAT US SO WRONG!! f**k THEM."

The rant continued, "I'm gonna keep talking sh*t to these white f*ggots until they unlike my page. f**king weirdo stalkers!"

Now, in a statement to TMZ, Soulja says, "I wanted to clear the air and let everyone know that my Facebook got hacked."

It's their final shot at redemption after losing several rounds in court -- including the 9th Circuit Court of Appeals -- Cameron and Tyler Winklevoss now want the Supreme Court to invalidate the settlement agreement they made with Facebook back in 2008 ... reportedly valued at $65 million.

The twins insist they were defrauded by Mark Zuckerberg during negotiations for the settlement -- which was paid in Facebook stock -- claiming the actual value of the settlement was less than half what they were led to believe.

The twins just released a statement, claiming their attorney intends to file a petition with the Supreme Court after they were shut down by the 9th Circuit today.

The 5,000 sq ft home includes a saltwater pool, glassed in sunroom, outside fireplace, 5 bedrooms and 5 baths ... but no apparent grotto, helipad or batcave.

So we gotta ask ...

The Winklevosses say in

- obtained by TMZ -- Zuckerberg and Facebook intentionally withheld instant messages sent by Mark in 2004, saying, "Yeah, I'm going to f**k them ... probably in the [ear]."

In another IM, Zuckerberg told a friend, "But they [the twins] made a mistake haha. They asked me to make it for them. So I'm like delaying it so it won't be ready until after the facebook thing comes out."

The Winklevosses settled their dispute with Zuckerberg and Facebook for $65 million, but they've been trying to undo the settlement on grounds they were defrauded.

Kelly wrote a diatribe on her Facebook page on Tuesday -- claiming Best Buy at the Ridgemar Mall in Fort Worth, TX refused to sell her iPod shuffles ... citing a store policy which limits how many iPods they can sell to a customer.

But according to sources at Best Buy, no such policy exists ... and corporate is PISSED -- in fact, a BB rep even left an apology on Clarkson's Facebook, explaining, "We spoke to the management [at Ridgemar] and they'd like to apologize for this experience ... their intention was not to upset you."

For some reason, Justin played Sean Parker in the movie.