Facebook stored hundreds of millions of passwords unprotected

Company admits to mistake and says it has no evidence of abuse - but the risk was huge

Facebook mistakenly stored "hundreds of millions" of passwords in plaintext, unprotected by any encryption, the company has admitted.

The mistake, which led to user passwords being kept in Facebook's internal servers in an insecure way, affects "hundreds of millions of Facebook Lite users, tens of millions of other Facebook users, and tens of thousands of Instagram users", according to the social networking site. Facebook Lite is a version of Facebook created for use in nations where mobile data is unaffordable or unavailable.