As you may have heard, Google began giving Gmail-like invites to Google Glass users. In short, when Gmail launched, Google let those with Gmail accounts to invite others to get Gmail (it was a limited beta as well). Now, Google has opened up to a select number of Glass Explorers the ability to invite friends to purchase Google Glass.
Here are some of the posts I spotted on this on Google+.
Here are screen shots of what the invite to invite email looks like and what happens when you click invite a friend:
This is an incredibly tough decision for a Glass Explorer. Who would you invite? A fellow developer? A friend who is not a developer? A family member? Someone who pays you off? ;-)
Google said they have sent out all the invites to invite for now and there may be more in the future.
I suspect Google had some excess Glass devices to sell because some of the #ifihadglass winners probably decided not to go through with the large purchase. So this is their way to get rid of that excess.