Carl Icahn has recently bought a bunch of ebay stock. He has claimed the company is mismanaged. He has also personally attacked Marc Andreesen. Here is the accusation from Ichan:
1) Marc Andreesen was/is on ebay's board.
2) While on ebay's board, Marc bought most of Skype from eBay.
3) He flipped Skype to Microsoft in less than 2 years, earning himself a multi-billion dollar profit.
Carl Icahn is running Marc Andreesen name through the mud. The basic accusation is that if Marc knew Skype was so valuable as the smart phone wars were heating up, he had an obligation as a board member to give ebay better advice on the divesture.
Now Marc is fighting back.
This is a comic schoolboy fight among billionaires.
Edit: After a bit of fact checking, it looks like A16Z only invested $50M in the skype deal. Their fund at the time was around $300M. His gain was on the order of $150 million, not billions. A16Z only had around 2% of skype, and ebay retained 35%.