Checking into States of Mind

I like Batelle's point about checking into things other than just location. Advertisers infer this today, does it make sense to make it more explicit? He writes:

" ... I wanted to build on my earlier post, "My Location Is a Box of Cereal," and Think Out Loud a bit about what I'd really like to do on Foursquare: I'd like to check into a state of mind.

What do I mean by that?

Well, imagine that instead of checking into a physical location, as Foursquare is mostly constrained today, I check into the state of mind I might call "In the market for a car." Or perhaps I check into "playing a great game of poker with my friends." Or maybe I check into "pretty bummed out about the death of my cat."

I think you get the point. The check in is, as I've argued elsewhere, more than a declaration of where I am. It's also a declaration of my state of mind, as well as my openness to a response from someone who might provide me with value ... "