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As TMZ previously reported, Mark and his girlfriend Priscilla Chan had been in the market for a Puli for a while -- and finally found one in Oregon. They even created a Facebook page for him.

In a letter Pradeep Manukonda sent Mark this past January -- and obtained by TMZ -- the 31-year-old depicts himself as "a son to my mother who has become helpless in supporting his kin."

Pradeep claims his mother is suffering from a serious illness with little time to live -- though he doesn't disclose the nature of her illness.

Pradeep is also unclear about how much cash he wants from Zuckerberg -- only that he promises to "repay the entire amount incurred for her treatment."

As we previously reported, Zuck obtained a restraining order against Pradeep -- claiming he posed a threat after he showed up at the Facebook offices and Mark's home.

Zuckerberg has obtained a restraining order against 31-year-old Pradeep Manukonda -- after Mark filed legal papers claiming the guy has tried to "follow, surveil and contact Mr. Zuckerberg using language threatening his personal safety" ... and the safety of his girlfriend and his sister.

Law enforcement sources tell us Pradeep had gone to several Facebook offices in Palo Alto attempting to contact Mark to ask for money for his financially-strapped family.

According to the legal docs, Facebook security also intercepted Pradeep at Mark's home on January 24 just as he was about to walk up the front steps.

Cops gave Pradeep a verbal warning -- but Mark claims the guy has continued to try to contact him through the mail ... even sending flowers to his home with a hand-written letter on January 28.

In one of his Facebook messages to Mark, Pradeep writes, "please help me, then I am ready to die for you." He continues, "Please understand my pain."

TMZ spoke with Pradeep Manukonda who tells us, "I'm a peaceful guy ... I'm sorry he thought I was trying to harm him."

As we first reported, Zuck obtained a restraining order against Pradeep -- claiming the 31-year-old posed a threat after traveling to the Facebook offices and Mark's home in an effort to contact him back in January.

Pradeep says he was dealing with a major personal problem -- and "I thought Mark would be able to give me advice." Pradeep wouldn't disclose the nature of his problem, but insists it had nothing to do with computers.

Early this morning, Selena's most recent updates had been removed and replaced with some vulgar language ... including a line that read, "Justin Bieber Sucks!!!"

Shortly before the cyber-takeover, someone calling themselves pkinJ0r posted a video to YouTube showing step-by-step how they got access to Selena's page.

But here's the rub -- pkinJ0r explained that he/she WOULD NOT publish his/her changes because he/she wasn't a "tw*t."

Instead, the hacker explained, "This video is to show how easy Facebook's new security page is to bypass."

So who published the anti-Bieber rhetoric??? It's possible pkinJ0r had a change of heart ... or maybe someone else hacked the page.

Bristol Palin's baby daddy is apparently dating a girl named Sunny Oglesby. According to her FB page, Sunny works at an elementary school, is originally from Oregon, and enjoys Eminem and "Family Guy."

TMZ has obtained a list of Facebook's Ozzy-themed spreads -- which were served yesterday in two cafes inside the company's headquarters in Palo Alto, CA.

The Cafe 6 diner served:
-- War Pigs (Pulled Pork) Headless Bat Wings
-- Frying High Again (Seasoned Fried Potato Wedges) & Crazy Grain
-- Mr. Crowleyflower (Steamed Cauliflower)
-- Prince of Darkness Licorice Frozen Yogurt
-- Sharronberry Frozen Yogurt