Phishing, Identity Theft, Online Scams, and the like.
While social media is supposed to make social networking and information dissemination a lot easier, ill motives and self interests have recently cropped-up. Damn, there is big money in online illegal activities and that does not even include the Dark Web. Troll farms for example charge in the millions just to spread fake news.
Although the actual intention of social media is to bring people closer, it resulted in immense bitterness and indifference to some, making us more distant from each other than ever before.