If you want to make friends, water your friend seeds.

Everybody knows a bunch of people by name, and nothing else, from various contexts. You go to matriculation, there's a bunch of people introducing themselves, too many to get to know. You work a job, there's 50 people whose name you know. You go to a party, your friends introduce you to 10 new people, and you don't have time to talk to them all.

The ones you don't talk to much, they are your friend seeds.

You move to a new town, and you know nobody, other than that one guy you never spoke to after the first week of university. Contact that guy.