Want to like someone, but he's not on Facebook? Want to mark something about her as a favorite but she's not on Twitter? Now you've got an option. Social Planes are paper airplanes marked with the colors and logos of Facebook, Twitter, WhatsApp, and SnapChat. You can download them for free as PDF files here.
It's a project by designers Rafael Ochoa, Caio Andrade, and Linn Livijn Wexell. They're interested in promoting the idea of getting offline and experiencing life beyond screens. Here's a video showing how people in a park responded when they received these offline notifications.
We're not a social network, but you should feel free to print out a Neatorama post and throw it at someone.