One interesting opportunity for teens, science and social media is #scistuchat, a monthly Twitter Chat with scientists and high school students. https://sites.google.com/site/scistuchat/.
They are a lot of fun. A lot of scientists that participate end up following up with different classrooms via all kinds of social media channels, e.g., Google Hangouts.
Would could envision a #tscnchat as a way to connect different sites, or even intra-site discussions.
If we could perfect the chat aspect of Snapchat for this purpose that would be awesome, http://blog.snapchat.com/post/84407744185/putting-the-chat-into-snapchat