When Friendster, MySpace,Facebook, et al started, it was about connecting friends online. People that already had a connection. When you shared something, you wanted to share something personal with friends. YouTube was about sharing your home videos. Not for money, but for actually sharing. What a strange concept!
Then people noticed you can monetize their content. No longer was it about sharing with friends, but creating for profit.
Social networks, as they were envisioned, are a great concept. As a method for distributing content to be monetized, not so much.