A 2012 tweet from the Chicago Cubs Twitter account has recently been uncovered because they sent out a picture to porn.  Awful Announcing attempts to explain how the 2012 tweet was sent out:

2012 saw a lot of third-party apps used for photo sharing on Twitter, including the likes of Twitpic, and it seems likely that the Cubs used one of those then to share the Williams photo. It seems probable that something then happened to that link, and redirected to this very different image. This doesn’t seem to have been the initial photo, as none of the linked 2012 responses seemed to indicate anything being wrong. (They have, however, now led to those people being barraged with a bunch of jokes.)

While that’s likely what happened, it’s much more fun to believe that whoever was running the account pasted a link of the last site they visited by accident.