Facebook Ads

I have a Facebook account, but I don't use it. I got it at the request of A, the woman I'm dating. She lives on FB and wanted to be able to have on her profile page that she's "in a relationship" with "me". So I signed up. I never really use it, and only have 3 friends; her and my two daughters. Sometimes I see A's FB page and have noticed the ads, usually for some company like American Apparel or the new Sex and the City movie.
Anyway, another friend of mine, Jim, apparently has an account (he's even older than me!) and, not knowing that I have one sent me an invitation to register for one and "friend" him. So I logged on to my page.
There was an ad. For one of those chair gizmos that old people attach to a staircase in their home when they can't walk up the stairs! What the hell?!? This is the type of targeted marketing I get?