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I did not know about the app, the idea is great ,was it a Nokia project? or did they "acquire-hire" it ? (bought it and shut it down ? ).

It was a startup and was purchased by Nokia in 2009.

Which was about the last time it was under active development. I always liked Dopplr but they just stopped caring post-acquisition.

TripIt is about as close as you can get to a functional Dopplr these days.