Screen shot 2011 09 22 at 10.15.18 AM 520x209 Zuckerberg: 500,000,000 people used Facebook in one day last week

Facebook CEO Mark Zuckerberg today announced at its annual F8 conference that in one day last week 500,000,000 people used Facebook . This means that over half of its reported 800 million users are logging on at one time, at least at some points.

This announcement is part of what Facebook’s EMEA head Joanna Shields says is the “biggest announcement around the Facebook platform since 2007.”

There are a massive amount of changes coming to Facebook today so stay tuned. We’ll be covering them extensively.

Make sure to check out all of our F8 coverage