As shown here at a recent Ask the Admin, Gaia is doing what it can to get Viximo to come out with a fix for the neighbor issue.
I think it may also help if the users effected by this problem also urge Viximo to help us out.
If you would like, they can be contacted at: email@example.com
Let me make it clear that this is NOT a call to mass e-mail Viximo or harass them in any way, that is not my intent.
This is just a way for GaiaOnline users to express to Viximo our problem so that maybe they will fix it more promptly.
I also want to have some neighbours again... :'( I'm just collecting the whistles, and I can't use them. I really wish that they fix that soon. I was trying so many times to send my sisters the invite to be neighbours, but this doesn't even work to my sister. Please fix it soon!