Actually it's already reached 199,870 people. It's going to hit waaay more at the end when the message gets tweeted and Facebooked all at once.

That's very succesful for so far.
A few weeks ago, Synereo tried also to organize a Thunderclap campaign.
They had a social reach of 127,575 users
https://www.thunderclap.it/projects/46704-synereo-blWhen you look to their graph, it rose a lot on the 19th of September but also on the days before
After the 19th of September, you see the weak hands dumping and now it's back again at his normal level.
http://i63.tinypic.com/2cxdpa1.jpg