Facebook’s pre-IPO hackathon kicks off with a standing ovation, hoodies and lots and lots of people

Facebook revealed that it is seeing in its impending IPO with one final hackathon as a private company, and things are already under way at Menlo Park.

The listing is set to be the biggest Internet IPO ever — which will value the company at an initial $104 billion — and Zuckerberg will ring the bell in from a stage that has been constructed for the event. Thousands of employees attended, initially, giving their CEO and company founder a standing ovation.

The images come courtesy of Facebook staffer Francis Luu. We’ve put a few of the most interesting shots below, but you can go check them out in full here, you know where…

Standing room only:

‘Executive hoodies’ are particularly popular:

Zuck gets a standing ovation, ahead of ringing the bell in remotely via Facebook HQ on Friday morning: