My wife’s last name is Lago, and she’s of Italian descent. This week Facebook started mysteriously displaying all non-user-generated website copy in Spanish. She never asked for it, and has also clicked a “not interested” link they’ve displayed when prompting her if she wants to continue her FB experience in espanol.
On her computer I just typed in “Facebook.com” to check something and saw the login screen above. FB is evidently not deterred by her user preferences.