I don't have a whole lot to offer this community as I'm mostly learning. I have always been a social person however and I can think of three things that genuinely make people like you more. Obviously these things are conditional and depend on the context, but often can help make people like you. Sorry if these things have already been posted

  1. Say peoples names when you are saying goodbye. The favorite word of every person is their first name. Instead of saying just "bye" its just as easy to say "bye john". This gives a more familiar feel and people will respond to it.
  2. Praise peoples friends. If you get someone alone want them to like you more say something like "your friends are a blast." This is a compliment they won't feel awkward about accepting. You don't directly say they are a blast but tacitly imply it. It works real well in my experience.
  3. Finally, this one is pretty specific, if your talking on the phone and someone is doing something funny, say they are cracking you up. Actually tell the person on the phone,. Its better than laughter because you admit that you approve of their humor. It makes em' feel good.

These are just opinions. Feel free to disagree and write about it.