I'm sure someone snitched you off (something) on your FB profile, holidays, something! As leavingwt mentioned, they have to investigate, HOWEVER, they can''t prove it and if a person snitched you off, that person has to prove it too......unless you actuall admit to what ever that something is .....then you will be taken care of...if you know what I mean. And if a person is accusing you and it gets nasty....make the accuser also be present to prove their case against you........remember a witness of two or three........unless you confess.........
Best thing is to lay low and admit nothing......