If you periodically prune your neighbors...
If someone hasn't logged in for a while and they don't clear their towns, I keep an eye on how long they're gone for and if it's a week or more I will probably delete them, but it depends on the situa...
Forum Discussion
I removed a few neighbours when the Stonecutters event started that were not playing. I don't usually monitor activity and graffiti does not bother me. I have a full list and I visit everyone daily.
