It's sad we view social media so negatively these days when it should be incredible tool for both personal and social growth. I grew up with irc and reddit, and it was incredibly useful for me not only find like-minded people but to learn that there's more to life than my small town, there are a variety of different people, ideas and careers out there.
Sadly the new generation of networks grew in a different direction but all of this still exists, and it's incredibly disingenuous to say that "there are no benefits for kids". There's still a community for any subject on both Facebook and Instagram except it's all buried under spam and bad intentions.