“Futurologist Ian Pearson predicts an explosion of such services next year.
“I’m surprised we haven’t got there yet. But it makes a lot of sense if a friend is a street away then you can meet up for coffee,” he said.
And it won’t end there as the physical and virtual worlds increasingly blur, he says.
“Instead of seeing people as they are you might well be able to see their Facebook profiles appearing as bubbles above them,” said Mr Pearson.”