Ideas on your banner copy for networking sites?

Can anyone share some insight to the copy your using for your sites advertising banners?

Example many use:

Join the #1 largest network of online marketers
Join the #1 fastest growing online network of online marketers

etc.

We cant all use those on our banners because it far from true.

So what can we use to make it enticing to viewers?

I was thinking:

Join the #1 most exclusive network for online marketers

So if you owner a forum with a few hundred members and your banner said:

Join a network of online marketers...... it wouldent sound so good, so id appreciate any creative ideas, thank you!