The Parntership for 21st Century Skills has published the 21st Century Skills Map for Social Studies with benchmarks at Grade 4, 8 and 12. This document provides the necessary language and examples for any teacher to make meaningful decisions in a classroom about how to present material encompassing 21st Century Literacy.
Here is an example for 8th grade communication:
Outcome: Research, organize and present information in clear, complete and effective formats.
Example: Research information on the local implications of a global issue of concern. Students organize their information and a possible solution and write a persuasive letter that is to be proof-read, peer edited, and finally sent via e-mail to a local public official.
Just by adding the words global issue and email to an already designed lesson, you have bridged the next century. Just try it. Just because this is a social studies content area, don't dismiss it. I am sure you, the great teacher that you are, can find a way to make this work in your content area.