Evidence shows that email use among the younger generation is declining: a 59% decline among US teens between December 2009 and 2010, according to comScore. In the same study, only the over-55s had increased their use of email, but it is still ubiquitous in a way that other social media networks are not. As of May 2010, 39% of US Internet users had never used a social network, compared with only 6% who had never sent or received an email. If you want to reach the majority of your audience, email is still the safest bet.