[jacquesm]

Meta data is often as valuable or even more valuable than the data itself.

Because you might be talking to the mob boss about the weather. But the fact that you are talking to the mob boss is an extremely interesting data point. It pins you to the map in a way that you are immediately a POI and causes a file to be opened on you and your other contacts to further map your place in the network. Who talks to who is very powerful information.

[TZubiri]

Having metadata be accessible to law enforcement is a good compromise between privacy and law enforcement.

[randysalami]

See The Wire.