Facebook has finally filed for an IPO. Here’s the most interesting stuff from its S-1 filing.

Morgan Stanley is going to be the lead underwriter on the upcoming Facebook IPO. Facebook plans to raise around $5 billion at a $100 billion valuation.

The EFF has launched MegaRetrieval.com with Megaupload’s hosting providers, to help Megaupload users get their legit data back.

The European Commission has initiated an antitrust investigation against Samsung, to assess whether it broke antitrust rules by seeking injunctions against rivals for patent infringement of essential FRAND patents.

ARM Holdings, the company which powers your smartphone, has posted its Q4 2011 earnings. It recorded a 45% increase in operating profit and a 21% increase in revenue.

Facebook is apparently going to file papers for its IPO on February 1. It will be raising $10 billion at a valuation of up to $100 billion.

The Mannheim Regional Court in Germany has rejected two 3G/UMTS patent infringement lawsuits filed by Samsung against Apple in December.

Motorola posted disappointing numbers in Q4 2011. It posted an operating loss of $80 million, of which $70 million was due to its mobile business.

Samsung posted record earnings in Q4 2011. It generated $42 billion in revenue, and $4.7 billion in operating profit.

Apple remained the leader in the tablet market in Q4 2011 with 58% market share, but Android grabbed about 10% market share, accounting for 39% of all tablet shipments.

Nokia announced its Q4 2011 earnings results. It has sold over 1 million Lumia units to date, but still reported an operating loss of $1.3 billion.

Microsoft reported its quarterly results with revenue of around $20.9 billion and a net profit of more than $6.6 billion. Its stock price has jumped to a 52-week high.

Kodak has now filed for chapter 11 bankruptcy, and is suing Samsung for patent infringement, along with Apple and HTC.

Oracle has claimed in a court filing that Google makes around $10 million in mobile advertising revenue from Android every day.

Apple has filed more lawsuits against Samsung in Germany, seeking the ban of 10 smartphone models and 5 tablet models.