I've used them and had some good results. By "good results" I mean a 1% CTR, which is actually an order of magnitude higher than a typical Facebook CTR. But be

I've used them and had some good results. By "good results" I mean a 1% CTR, which is actually an order of magnitude higher than a typical Facebook CTR. But because you can choose to pay CPM or CPC, for a high performing ad like mine I might only pay £0.20 per 1000, which means I can get a click with tight demographic targeting (and they weren't junk clicks) for only £0.02. Try doing that on Google! Of course, the other reason is that Facebook is the new hotness and lots of companies feel they ought to up their "social media spend". But if you're smart you can get yourself a pretty good ad deal there.