All the early reports (before his name came out) indicated that he had placed a link on his FaceBook page (dumb), but that appears not to be what happened. Somewhere off in the internet he clicked a FaceBook "like" button, which (quite possibly unknown to him), caused that link to show up on his FaceBook page. Moral of story: Be very, very careful when you click those FaceBook Like, Google +1, Tweet, etc., buttons. The whole world potentially will find out. KOMO: Popular teacher arrested for allegedly possessing child porn
I also expect this to be used as a tool for entrapment, if it isn't already. We know that our emails, postings, etc. aren't secure. If the security goons can spy on us on-line, why can't they fake supposed comments and "likes" of ours? In fact, there was a thread here a few weeks ago about exactly this; the authoritehs faked comments from a news reporter, trying to get him in trouble, because they didn't like something he'd reported on. Will have to go dig it up.
Found it: Misinformation campaign targets USA TODAY reporter, editor http://www.travelunderground.org/in...paign-targets-usa-today-reporter-editor.2887/
some of these social media have options, sometimes perhaps mistakenly turned on by default, that share your searches with others. be forewarned.