level 140, let me give you a tip... it's easier to recruit people on the facebook 'add me' mega discussion thread...
i got my 500th mob in 2 weeks, you can do it faster if you post on those threads constantly, like once every hour. optimal players to get is 1000 so you can get 500 limited edition loot. if you're hardcore, get 3000 mobs so you can have 500 limited loot per type of weapon, armor, and vehicle.
bonus tip, if you use firefox, load grease monkey, and then load 'autoplayer' , it plays for you when you're not.