Google lets Glass Explorers 'invite a friend' Google has started sending out emails to owners of the Google Glass Explorer Edition, offering them the chance to invite one friend to join the programme. Numerous Google Glass owners have received the invitation, which includes a form for sharing Glass with a friend, according to Marketing Land. "We love sharing Glass with our friends, because adventures through Glass are more fun with others," Google wrote in the email. Here's your chance to invite one friend into the Glass Explorer Program. UK residents shouldn't get too excited, however, as only people living in the United States are eligible for an invitation. They also have to be 18 years of age or older, and be able to pick up the device in San Francisco, Los Angeles, or New York. Google initially confirmed to Marketing Land that invitations were being sent to "a small subset" of Glass Explorers, but in a later update, Google employee Sarah Price told Explorers that no more emails were going out with invitations. Google opened its 'Glass Explorer' early adopter programme to the general public in February. Applicants were required to post a message of 50 words or less on Google+ or Twitter with the hashtag "#ifihadglass" featured. Successful applicants were then able to buy the device for $1,500. The Explorer Edition of the Google Glass augmented reality eyewear receives data through Wi-Fi, or it can tether via Bluetooth to an Android device or iPhone and use its 3G or 4G data. Google Glass also has a GPS chip. Users issue voice commands by first saying "OK Glass," followed by the command, or they can scroll through the options using a finger along the side of the device. The Explorer Edition also features an interchangeable sunglasses accessory that twists on or off.