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http://techcrunch.com/2009/08/10/facebook-acquires-friendfeed/ http://techcrunch.com/2009/08/10/facebook-acquires-friendfee... FF was acquired about 15 months
by cliffchang 16y ago
http://techcrunch.com/2009/08/10/facebook-acquires-friendfeed/ http://techcrunch.com/2009/08/10/facebook-acquires-friendfee...
FF was acquired about 15 months ago, so that's about how long Paul was at Facebook.
Also, I imagine being a partner in YC is very much a fulltime job.