Well, online groups are rewarding and fun. The key is to participate by either reading and/or writing. You might put up a profile picture and join some groups for starters. You can also invite your friends using their email addresses.
Hi-I see that you are new to Zoobird and I want to welcome you. I see your interested in the global warming issue. I'd like to invite you to join my new group, Environmental Zoo where you can express your concerns, solutions, ideas or anything else you'd like to. See you there?