I got an invitation a couple days ago when I searched "mutex lock". Not sure whether search history makes a difference, but it worked for the gf too a couple mi

I got an invitation a couple days ago when I searched "mutex lock". Not sure whether search history makes a difference, but it worked for the gf too a couple minutes later: http://i.imgur.com/l4rGps5.png http://i.imgur.com/l4rGps5.png