Looks like a stock price of $31.50 would give facebook a P/E ratio of around 60. For comparison, GOOG is 18.5 and AAPL is 14.
More financials are available from the updated S-1: http://sec.gov/Archives/edgar/data/1326801/00011931251220819...
And it looks like Q1 2012 net income was actually lower than Q1 2011. Oops!