Last night was Facebook's last night as an independent company— today it joins the stock market and is expected to rake in tens of billions of dollars in one of the biggest Initial Public Offerings in American history. So how did the company celebrate? By having a rally and an all-night "hackathon" complete with kegs, table tennis and field hockey.

Facebooker Francis Luu took photos. The event looks a little bit like seniors celebrating their last night at school after graduation— except instead of a diploma, they're about to be handed millions of dollars. Take a peak at a few shots above.

[Francis Luu via SAI]