Guide to New Bonuses (Tiles, Stage, Farm, TV6)

Hi, i have a question about tappables in general.

I always leave one handshake in my farm or tile, this morning i woke up to find that around 20 friends have visited my town during the night. But there was 1 handshake on both the farm and the tile. Is there something i don't know that makes my farm spoil or something? I can get 3 4 handshakes during the day, does this mean that something went wrong during the night or simply that those friends didn't tap tappables but houses and i can start removing then from my list to get better ones?

Thanks!