In public I am a very lively person. I'm friendly, always smiling, and look like the happiest person in the world (I get this compliment the most). That's just how I am - it's not an act. If it is I don't consciously realize it is. I am probably a bit annoying (actually I know I am) - but in a way a child is annoying when they want you to play and you're busy.
I subconsciously only interact with people in private, real life if I want something from them. Money, materials, if I want to mooch off them for work related things, etc. I literally have no friendships. If my parents were dead, and I got into a car accident I would have no idea who I would call if I wasn't using the shit out of someone at the time. I have in the past been noted to have problems with my "social environment" in my axis 4 because I do not form relationships unless I want something. There is a small part of me that does desire close relationships and intimacy with others but once I obtain that I become very bored, very quickly.
I interact with people online to gain attention I imagine and have done this since the internet existed. But I also definitely interact with them for money, materials as well. I was a very attention deprived child.