One interesting development from Facebook being valued at $15 billion is that Peter Thiel, likely owns 5-7% of Facebook.
Peter Thiel put $3.5 million of support for the Sens life extension research and prizes.
Peter made that donation when he had a net worth of about $100 million. A successful IPO for Facebook in 2008 would likely place Peter's net worth north of one billion dollars. This will likely be increase the odds for further support for Sens.