Americans are still reeling from last month’s revelations that the NSA has been logging phone calls since the terrorist attacks of 11 September 2001. The Congressional Research Service, which advises the US legislature, says phone companies that surrendered call records may have acted illegally. However, the White House insists that the terrorist threat makes existing wire-tapping legislation out of date and is urging Congress not to investigate the NSA’s action.
Meanwhile, the NSA is pursuing its plans to tap the web, since phone logs have limited scope. They can only be used to build a very basic picture of someone’s contact network, a process sometimes called “connecting the dots”. Clusters of people in highly connected groups become apparent, as do people with few connections who appear to be the intermediaries between such groups. The idea is to see by how many links or “degrees” separate people from, say, a member of a blacklisted organisation.