Social networks vs Email
One of the researchers at Hitwise, have released a graph that show that webmail services are being taken over by the top social networking sites. This stat does not include desktop emails sent from your mail programs but it is an impressive comparison indeed.
A lot of people are abandoning traditional emails because of a number of issues. Spam is one of the biggest, social networks are not immune to spam but it is so much easier to control because it is a closed system, whereas email is completely open. Social networks like Facebook allow people to keep in touch in a far more "immersive" manner, they do email, too.
Perhaps we are seeing the end of the email generation and will soon see individuals and companies move away from traditional emails. Moving on to a more secure, more productive and measurable means of communication.