Facebook didn’t confirm any new growth numbers this morning at its developer conference, but did say that it saw at least a half-billion users access the site in a single day last week.

The most recent statistics from Facebook in June said that the company had more than 750 million monthly actives. (However, in a spoof at the beginning of the conference, SNL actor Andy Samberg, who was pretending to be Facebook chief executive Mark Zuckerberg, did show a chart suggesting the site has more than 800 million actives.)

Facebook has long said that at least half of its monthly actives log in on any given day. So if it has more than 800 million monthly actives (or people who have logged in at least once in the last 30 days), it wouldn’t be surprising to see more than 400 million users log in on any given day.