Some = 600 Million

Well, in fairness 200-600 million. Not like it’s a lot or anything. Read this Facebook blog:

As part of a routine security review in January, we found that some user passwords were being stored in a readable format within our internal data storage systems.

Sounds kind of harmless, right?

Or maybe not.

The Facebook source said the investigation so far indicates between 200 million and 600 million Facebook users may have had their account passwords stored in plain text and searchable by more than 20,000 Facebook employees. The source said Facebook is still trying to determine how many passwords were exposed and for how long, but so far the inquiry has uncovered archives with plain text user passwords dating back to 2012.

I think you should assume that your Facebook password is public knowledge at this point. And that their public statements are basically a lie.