Originally Posted by
kschlag
There's an "edit" button at the top of the social menu you visit your neighbors from. If you hit that, you can delete neighbors one at a time.
I just weeded through my inactive neighbors. Now is a very good time, because nearly everyone who's active just got a royal dragon. What I did about a week ago was delete all neighbors above level 17 without the new dragon. People under level 17 were deleted if their buildings aren't moving and they have no hearts to pop three days in a row.
I hope that answers your question.