Twitter, Facebook, Google+, Tumblr: there's a host of other social network companies out there, & chances are you use at least one of them. Bring your contacts there back to Delphi, your internet home.
This app says, "Get the most out of Twitter by finding the right people to share the conversation: Tweeter Tags makes it easy to declare your interests and find new, like-minded friends. Have a question you need answering? Find relevant people on Twitter to ask. It only takes a moment tosign up and tag yourself."
If you're tweeting for or to a very specific group of people or interests, might be well worth signing up for. I can see using this if you had a knitting forum, a horse forum, a Mac forum, or any other kind of specialty forum.
Looking for other space enthusiasts? Crafters? Political activists? Try out http://tweepml.org/ to find lists of people that share your interests. (I just used it to follow other space enthusiasts, and ended up running across someone else from Delphi!)