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 only delete based on activity. If they haven't been on in a week, then I delete. During events, I generally only give three days. I don't really pay attention to who visits me and who doesn't as long as I have enough people visiting during an event to be successful. I only look at when a person has been on when I can't find something to tap. At first, I was deleting people daily but now I have rarely deleted people. I do have a couple spots open which I will add to once an event starts.
