An Idea for the Twitter Team

Twitter should track airport codes (e.g. SFO, JFK, etc.) to allow mutual followers to see when they're in the same city as one another. It'd be a lightweight Dopplr (which should be a feature, not a product, imho).

Use case: I land in San Francisco and twitter, "In San Francisco for a couple of days. Who wants beer? SFO" At the Twitter website, "SFO" will automatically be linked to a page that dynamically pulls a list of my friends who are also near SFO. The list would include people who have home cities near SFO and people who are in San Francisco that week and have twittered in a message with "SFO".

That would be super freakin' handy. And airport codes are perfect! They're unique, very short, ubiquitous, referenced everywhere, and provide the right level of location granularity for this sort of coordination.

Bonus points: let me send a message to Twitter that says "who SFO" and get a message back with names of friends currently in the area. More bonus points: let me send a message to Twitter that says "where SFO" to change my location without sending a message to my friends.

I think I just passed along a freakin' stellar idea, and would love to see the Twitter guys do it and get richer for my brilliance. ;-)