A little over a year ago, we used a service called Open X on TuDiabetes.org and EsTuDiabetes.org, to serve our ads until we found ourselves talking to nobody when faced with a tech issue that resulted in no ads getting served. At that point, I decided to try Google Ad Manager, a free service that does the same thing (help you manage ads) as a hosted service by Google.
More than a year later (now it's called DFP Small…Continue
Encourage members to welcome new members, by introducing new members yourself to get the ball rolling. Put a link to each new member's profile in a broadcast message along with a brief description of the new member.
Suggest that members to welcome new members by posting a comment on their profiles or by sending friend requests with a personal message.
Here's an email that I recently sent to my group. You can modify it to suit your network.