Facebook can be interesting from a wide range of angles, including the auto-feed advertisements. These are "tailored" to each individual log-in and supposedly "smart" from the perspective of AI. The ads are selected on the basis of keywords that a user ... ummm ... uses.
So my log-in produces a side bar of ads for items such as shoes (who'd have thought?), books (duh!), hugely expensive holidays in exotic places (a girl's gotta have dreams, right?), and now, through the power of Artificial Intelligence, programming algorithms, and probably a splash of witchcraft - I'm now getting fed ads on becoming a librarian.
OK, we can all do with professional developing, and there's always new fields opening up in cataloguing (yep, that's a pun). But I'd be hesitant to rush off and sign up for anything as a result of this particular ad. I did check into the identity of the advertisers, and was more than a touch surprised. You'd have thought They could have done a little better in the PR department.
Just a thought.