Note: This site is in no way associated with Facebook or the game's developers.
It's just one fan's tips and strategies.
Building A Mob Through Facebook Groups
One of the newest ways to get 500 mob member fast is to join an 'add me' group on Facebook. You should know what groups are on facebook, so I'm not going to go into that aspect of it. But there are groups on Facebook soley dedicated to gaining mob members not only for Mob Wars but other Facebook games as well. Basically they work like this: You join the group, and you will get a number of people that will email you with requests to add them to your mob each day. Admin status of these groups rotates, so eventually you will get the administrator status. When you do become an admin, you can then send out a mass message to all in the group, and you will get deluged with friend requests and adds. It couldn't be easier.
I'm not going to direct link to any because they fill up almost instantly, but check go here to search for one:
Mass Add Groups
Along the same lines as regular groups, Mass add groups will allow you to add members to your mob though a similiar mechanism. The twist is that with Mass add groups, you can add members to a number of facebook games and applications, not just mob wars. Something to think about if you play a lot of facebook games.