Do you use the site Meetup? It's a good way to get connected with new groups by finding others who are interested in the same type of activities you are. I noticed that the site now has a "Good to See You Button" which you can use to easily send a note to someone new you met. This is a simple way to connect and say "hello" without having to write out an entire email.
Remember that the first time you meet someone new you need to put your best foot forward and make a good impression. Then, ask a new friend to meet you for coffee and get to know them better. It could mean the start of a new friendship.
I've used Meetup to find other book lovers and also to join a few business groups. Have you found it a helpful resource?