Ask HN: Whom do you want to meet?

Hey HN, I've been thinking about this issue of making new friends, especially for those of us who've been out of Uni for some time. It seems the only online options are meetup.com, dating sites, and cold-emailing people. (I know you can meet people in real-life through clubs, sports, etc., but I'm interested in online options). Do you have an interest in meeting new people? What kinds of people would those be? People who ... .could help you professionally? .are available for dating? .are similar in culture? .have similar interests? Any feedback is appreciated, thanks!