I don't get it...

This isn't so much a rant as a general wondering about people...

Why do people add you as a Friend when you have no idea who the heck they are???

I mean, I'd understand if these people were members of one of the comms I'm in or whatever, that'd make sense, or if they were Friends with some of the same people as me, thats totally cool, but twice lately I got messages to say totally random people have added me as a Friend.

I do not know them, and seem to have nothing in common with them. Am I the only one who thinks this is weird?

Also, can I just check, if I post stuff as Friends Only, then only the people I add as Friends see that, right? Not the people who have just added me? Sorry, I'm not sure I explained that well, and I should probably know this anyway, but LJ still confuses me on occasion...