But I'm a genuine introvert and don't mind.
I'd say "Introverts of the world, unite!" but that would kind of defeat the purpose.
I've speculated that the 150-person limit on pre-political human group sizes is due to the limits on our attention: http://www.tjradcliffe.com/?p=1203
That speculation was based on the idea that men form groups to support each other in mate competition, but it could well also be a primary phenomenon, with 12 or 13 being the absolute upper limit of our attentional resources. That would give 150 people as the typical group size. Either way, it would be very interesting if we could tie those two magic numbers--7 and 150--together somehow.