Ok, it's true that the onus is on us to look after active friends. But check the event history at The Town Hall to see "active friends" just giving information about 5 days, and with a NOTE that our friends gave "aid", or sat in our tavern. What if they are online but not interacting with the neighbors?
Sometimes I do it, I'm online but it's just to pick up my production. I didn't "aid" or sat down at my friend taverns.
Well, I think I'm not looking for an easy button to erase friends, just information when they were last online, so I can decide my action with more wisely to my neighbors..