Kinda freaked....

Sooo I just logged onto Facebook and was told someone just requested a new password from my account. Then I went into my WoW account and was told that someone ( by multiple people) had just been on saying they were me...Then my dad came downstairs saying someone had pulled into the driveway and opened the door earlier that night, only to close the door when the dog started barking...wtf is going on?? I'm freaked. Just changed the password on all my accounts. Any advice?