Pre-IPO, Facebook Kicks Off Hackathon 31

A toast to its early code-cramming all-night product building sessions, Facebook held its 31st Hackathon at its Menlow Park HQ starting last night--one last hurrah before "FB" starts trading on NASDAQ this morning. 

Later today, Mark Zuckerberg will remotely ring the NASDAQ bell at start of trading, post-hackathon, from Facebook HQ. 

A packed crowd gave Zuckerberg a standing ovation. 

Timeline, chat, and video features on Facebook today started off as hacks during the hackathons Facebook holds every few months.

Facebook will sell 421 million shares at $38 per share. 

[Image: Brian Zeitler, Everett Katigbak, Matt Harnack, Francis Luu, Facebook]

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