One company creates a phone system designed to encourage you to hang up to save them money. Another creates a phone system designed to make it easy to stay on hold indefinitely. I wonder where this ends.
A close-to-complete social map, for example, should be fairly doable to construct, just from observing who calls eachothers or send SMS to eachothers, you can even assign fairly accurate weights to the relationships based on frequency of call/sms and frequency and duration of being in the same spots.
Not "should be possible", "is happening."
I can tell you for certain this is taking place and they are collecting and already using this data to try and make more money. One of the things they look for is for who are the "influencers." For example, they have noted that certain people send short text messages and make short outgoing calls, but often get many responses that are much longer. Think of someone who just says "sup?" and 10 people respond with big stories about their day or offers to hang out, etc.
These people are often offered discounted phones or given excellent customer service or some other such special treatment. Mostly without ever even knowing.
The Economist has an excellent article on it all: http://www.economist.com/node/16910031
How long 'til what I wanted yesterday no longer represent an interest today?
Uh, one day?
A bug in the code is worth two in the documentation.