Google expands Google Glass sales, lets early users invite 3 friends each

Mountain View: Google is relying on a little social networking to put its Internet-connected glasses on the heads of more people. The expanded sales of the device known as Google Glass will come as part of an invitation-only program announced Monday. The roughly 10,000 Glass owners who began testing the device earlier this year will each be allowed to invite up to three people to buy the device. The early Glass users are primarily computer programmers and winners of an online contest conducted earlier this year.