I begin to understand what Richard Stallman has been saying all those years. Although I don't like the guy on the personal level, this incident make him completely right - running closed source software can compromise your rights. (rights to privacy in this case). I also want to thank the author of this post to discover this! I wanted to try Path some time ago, now I can safely avoid it without regret.
there was a furor recently where it was revealed that OS X and Windows collect data on what access points you have associated with. what was omitted was that linux does exactly the same thing: the wireless subsystem has a debug print (at a debug info level turned on in all major distributions) that will log the MAC address of the AP you just associated with.
it's still there, afaik.