From the Los Angeles Times, a particularly chilling story about social websites and third-party data: Jane Yang, a 30-year-old marketing coordinator, was curious the other day to see what would turn up if she searched for herself on Reunion.com.

Google acknowledges that it is now testing ways to use some of the data it has been gathering to better aim search ads at Web surfers, although it won’t say how. This is important because it marks the first time Google is using the store of data...