Flirting is supposed to convey romantic interest, but it's very confusing. Signs of flirting are often cited as laughter, smiling, light contact, etc...however, many of these things merely indicate pleasantness and are usually present in conversations between friends. This results in either misconstrued intentions or confusion (Is he being nice or just flirting? Is she laughing at my jokes because I'm funny or because she likes me?). The only "non-friendship-esque" flirting I've heard of is extended eye-contact, and that's really hard to pull off without looking creepy.
I don't know how people do it, man. I really don't.
I don't know how people do it, man. I really don't.