It showed up on my news feed

What you say when someone accuses you of Facebook stalking. Since it just showed up on your news feed, you couldn't have been secretly reading their profile, right?

Joe: Man, that party last night was sick...

Mike: Oh, that one you went to at 9:23 pm at Bob's house?

Joe: Whoa, how did you know that? You aren't stalking me, are you?

Mike: ...it showed up on my news feed.