In them? Not at all. But by reading it and understanding probable causes and stretches/exercises that can alleviate or prevent the pain, hopefully things would get better.
That being said, consulting a doctor would still be a good idea. But having something you can do immediately, that gives you tools that could help right away, isn't bad either.
It can be both.
My husband and I met through an online forum, and were friends for a long time before we decided to try a romantic relationship.
I think it's a fallacy to assume "online" only means dating sites these days. Many people's social lives are online, so that's where they meet friends and partners