Mountain View's kept itself as the gatekeeper for Google Glass, with developer signups at I/O and a social media contest, but now it's letting some users spread the wearable computing love. Google+ is lighting up with reports that Glass Explorers are receiving emails from Page and Co. allowing them to invite a friend to snag a device by becoming part of the program. In order to be eligible, invitees must be at least 18 years of age, a US resident and willing to pick up the hardware in San Francisco, New York or Los Angeles. We've reached out to Google and they've confirmed that "small subset of Explorers" have receive
