Got a first hand look at the social perk yesterday when ganking a US player. Our small group was able to escape.
IMO, it's not a bad idea, let people eat up their points with the perk, but the other players spawned right in the middle. Since it took time, they should spawn farther away IMO.
A BR limit would be nice but not necessary. Although I am part of a gank group I ~love~ to see even fights. Would have done the 3v3 (even though I think their br was greater) in our light frigates until we saw that Santi arrive. Then we tucked tail and ran.