My Dad and I would spam sending Facebook friend requests to strangers, increasing our Mafias' size and destroying anyone and everyone. Fun times. Nonetheless, there wasn't much gameplay other than clicking to buy stuff and clicking to battle others

I think I was nearing around level 2000~ by the time they shut down, basically a semi idle game, had some really cool collab events like Green Hornet and X-Men First Class items you could get for your mafia.
Just a bunch of management clicking, fun time, dopamine go brr