It isn't adblock...it's clickfarms that are killing it. Some people buy likes to look popular, and these are done via bots or underpaid folks in poor countries. Meh, no big deal, right? Well, if you buy likes, those accounts are pretty worthless, and the lack of interaction means your posts will be rated badly, and not shown to nearly as many of your fans who are real people. So...just don't buy likes, then? Well, the problem doesn't end there. To disguise themselves, the spam accounts go through and click like on random different things to obscure patterns. Legitimately bought ads will produce mostly worthless likes from clearly foreign accounts, regardless of where they claim to be from, or how you filter your ad purchasing. This is why I no longer purchase facebook ads in pursuit of likes.