Walyou, a great site for interesting information and more, has a great collection of cheat sheets that have tips, shortcuts, and more for social media sites. The sites include Google+, Pinterest, Twitter and Facebook and have some great tips for making them more useful and easier to use.
These are great for finding some cool new features or shortcuts and also great to help newbies get started.
Check them out here: http://walyou.com/social-media-cheat-sheets/
Social Media in Education - Connect, Share, Learn, Communicate and more
Twitter, Google Plus, Facebook - a nice comparison
Google+ - more reasons it's great for educators