Newt Gingrich used social media to announce his candidacy to appeal to the "youth".
However, he confused the medium with the message.
Social media by itself does not make anything youthful. It's just a communication medium that can appeal to any demographic. In fact, 53% of Twitter users and 37% of Facebook users are 35 and over.
It's how you use the medium and the content you pump into it that matters.
Newt will need to change his content, messaging, and persona to address the pain points of the youth. The channel in which he delivers the message does not matter.