1) "Do you mean something like an automatic check-in based on your current location?" - gowall doesn't like this, see: , more of a reminder service maybe? It's open to interpretation what you'd do with the information once you could predict someones intent to check in.

2) Twitter leaves a lot to be desired for spontaneous event organization. What if all of your friends aren't on twitter, or you need a minimum number of people to confirm before, say making reservations? Twitter is still a tool that can get you part of the way there most of the time.

3) Thanks, maybe it'd start as targeting startups.

4) Clarification on this idea coming.

5) It's a huge interface challenge for sure, I hope someone figures it out.

Thanks for your feedback!