Nice move by Virgin America to append the ways to reach them on common social media platforms on the base of their emails. I've seen this on the web, with the "Add This" functions (see this end of this post, for instance), but great move to include this type of alternative communication to e-mail. I'd love to see this trend expand, much like RSS with web pages, to allow automatic detection and aggregation of social network presences from an e-mail sender. Maybe an Outlook plugin?
That's today's million dollar idea.