I have no doubt that this is not even remotely a new idea. Probably already in works. But here goes:

Step 1: Get “augmented reality” glasses like the ones discussed HERE.

Step 2: Get AR glasses widely accepted.

Step 3: create an app for them that works thusly:

3a: You are out and about, and you see someone you are interested in, who is also wearing AR glasses. You are, however, something of a social coward (not too surprising, given that you’re an early adopter of augmented reality glasses).

3b: You look at said interesting person and mutter “bing” or some such. The glasses, due to the magic of WiFi or whatever, taps in and recognizes the user.

3c1: Nothing happens, and you go about your day, a sad, lonely shell of a person. End of story.

3c2: The other person has looked around, seen you and decided that you were interesting, so they “binged” you as well.

4: Since both glasses “binged” the other, an alert pops up, and puts you two in touch.

5: You may now approach each other with minimal worry of soul-crushing rejection.

The beauty of this: it only works if there is mutual interest.