Handshake. app for iPhone and iPad
Handshake is a fun way to meet interesting people around.
You can create and view nearby events anonymously.
You can then chat the hosts of these events anonymously, either the host or the guest choosing to reveal themselves once they feel comfortable.
Only once both the host and guest of the event have decided to reveal themselves does the other see your identity, completing the handshake process. At this point you can decide if you would like to continue that event with this person.