>Social media is a cancer on society as a whole, let alone children who are still trying to figure out who they are. It serves absolutely no positive purpose that couldn't be done at least as well through private chat groups and the like.

Social media provides decentralized information transmission, so people (kids are people) are able to obtain information without it first being filtered through a small cabal of self-interested media corporations and governments. If there was no social media, the Iran war would probably have overwhelming popular support like the Iraq one and there'd already be US boots on the ground.