Reminder

1. friends - well, ok, these people you treat seriously, oh you know a word friend :D
2. colleague - we use this word and it doesn't refer to a co-worker, but people you know, you like spending time with, but it's not a matter of life and death
3. acquaintance - just a person you know, from school, work, dunno. you say hi to each other, sometimes make a quick conversation, but that's it. just a familiar person