Do online relationships work?

In the past 2 years I’ve tried to make online relationships work but… they haven’t worked out. It just makes me feel like its pointless trying sometimes but I do know a few people who have had successful ones and ended up together.
What are your thoughts on this jellies? Do you think it’s possible to have a good chance at an online relationship? If so, how?
Please don’t answer this question with “Try out a person in real life.” or something along those lines. I have my reasons for not having that kind of a relationship at this point in time :)
Thanks folks!