This is a response to Ripard Teg's "
Prepare for Staging"
I suspect the "social wall" is an imaginary construct created by an economist to explain psychology which he doesn't understand.
As a casual gamer (sure, I'm logged in to EVE for several hours a day some days, but I'm rarely at the keyboard for three hours nonstop) I play in fits and spurts. This is anathema to forming lasting social connections: the best WoW guilds and EVE groups I've been part of had a core of social people with a retinue of coconspirators who would provide the necessary "social inertia" to keep the group running when the core were temporarily away.
My main examples of "overcoming the social wall" are casual and hardcore raiding guilds from World of Warcraft: you'd start conversations with people in the area that you were questing, people you were running PUGs with, or met through other means. Then you'd find that you have a similar interest and playtime, so you'd start looking for them the next time you played. Eventually you'd end up recruiting them for your guild.