Agreed, it doesn't make much sense to single out one of them and give a free pass to the others... Facebook has an awful business model, but so does other big tech companies, especially those that are based primarily on user data and content. They all have tapped into the market by using human psychology and manipulating it for profit.
Also, maybe it's just me, but I can't stand the "[insert social media name here] is ruining society and human relationships" rhetoric or the even worse one - "internet and technology is ruining us". No, there are plenty of good uses for it all, but if the majority of people wants to use it as a replacement for interpersonal relationships and actual human interaction, or use it to one up each other and feel better about themselves by creating an alter ego with happier life, then it's just a manifestation of the human nature, shallowness, superficiality, insecurities and immaturity; don't have to blame technology for that.
Also let's be honest, an average user doesn't even understand or care about the concept of privacy and is gladly sharing their personal data every day without second thoughts, with the classical answer "I dOn'T hAvE aNyThiNg tO hIdE" when asked about it. So why we're wondering, really?