Traffic to social networks surpasses webmail in the UK
According to Hitwise, UK internet users visited Facebook, Bebo and MySpace more times last month than they visited Hotmail, Yahoo! Mail, Gmail and other webmail services:

This confirms that social networks are starting to eat into the web-based email providers’ dominance of the internet messaging market.
Does it? While traffic to social networking sites grows steadily, visits to webmail sites as shown above do not decline correspondingly for most part of the chart. Also, the graph only counts hits, not time spent on the sites or number of messages generated (not to mention non-webmail Email traffic).
Until the walls come down between social networks, I can't see myself giving up Email as the primary method of staying in touch with friends and family.