Do you know what a "like" is? For many people likes are really important, and they would do everything for them. But, in fact, what is a "like"? A "like" is no more than disclosure, in other words, money.
Some people have measured the level of affection of their friends and relatives based on the amount of tanned in their photos. Which is a totally wrong and wrong judgment, because no one has the obligation to enjoy the photo of anyone. However, leaving the social / personal core, and entering more in the commercial branch, for these people yes a "like" can be worth a lot. Because when we enjoy something, we are unwittingly divulging the photo, page, profile, account and so on. Including tens of thousands of people who make a living out of it.
In my opinion this internet thing is more valued than it should. And that should concern people more since there are others who get fissured by it. But in the matter of advertising for free, it is nothing new that people are cheated every day on the internet.