1. Be the social coordinator.
Ideas: Throw a cool mixer, get a group together to try out a just-opened restaurant, or round people up to go play bar trivia. Not only will you be the center of attention—everybody will make it a point to say hi—but also, the next time someone has a party, she’ll think to include you in the guest list.
2. Deepen your casual connections.
If you have a coworker or neighbor whom you want to know better, invite him or her to a low-key gathering, such as happy hour. Hanging out in a different environment (read: not the office or your apartment building) helps transition your relationship from acquaintances to friends.
3. Introduce yourself whenever possible.
It might sound obvious, but there are so many chances to meet potential pals that people let slip by. Try approaching someone you think you’d like to get to know. If you’re shy, think of how much you’d like it if someone struck up a conversation with you. The other person probably feels the same way.
SOURCE: Ann Demarais, PhD, author of First Impressions: What You Don’t Know About How Others See You