As you know, I love Penelope Trunk for the questions that she raises. The following post originally appeared as a comment on her post about friendship.
1) Religiously email your friends on their birthday. No matter what, you’re guaranteed to bring them a smile and get an update on their life.
2) Any time you meet someone interesting, ask them to lunch. There’s nothing like a good 1:1 session to build a real relationship.
3) Any time you see something that person might like, email them a link. It shows you care, and gives them an opportunity to write back.
4) Hold on to the friends you have. Relationships do tend to decay over time, and a long-standing friendship is really something special. If you simply make sure that you don’t lose your friends, you’re already ahead of the game.