If you have an Android phone, Google tracks your location (GPS, cell towers and maps-wardriving-provided Wifi hotspots at least), so it's probably easy to see who met who. Maybe they also save seen bluetooth devices.

Phones don't record conversations in the pocket by default yet, but it's not inconceivable when computing efficiency improves that recording is always on, and keyword data is saved by default. Handy if it can creates calendar markings from verbal agreements...

And with Glass, video too.

So meeting in person is getting less secure as well.

> And with Glass, video too.

Glass adds the perversion that you don't have your say regarding surveillance of society, anymore. Your "friends" will do it for you.

Only solution: Get vocal whenever you see somebody wearing Glass.

Most phones let you pull the battery out, still.

Even when they don't, it's probably easy enough to disconnect the battery on your own.