Security guru Bruce Schneier has just posted an absolutely cracking article on data as a potentially damaging asset, one often misunderstood and poorly regulated. He talk about why so much data is being stored, why that's dangerous, and what we should be doing to fix it:

If data is toxic, why do organizations save it?

There are three reasons. The first is that we're in the middle of the hype cycle of big data. Companies and governments are still punch-drunk on data, and have believed the wildest of promises on how valuable that data is. The research showing that more data isn't necessarily better, and that there are serious diminishing returns when adding additional data to processes like personalized advertising, is just starting to come out.

Give it a read here.