On the left are the Google Plus, Twitter and Facebook Like tools, on the right are social media icons for Delicious, digg and StumbleUpon. The really nice part about these controls is that they are all built-in to mojoPortal. You don't need to hunt down the correct code to use and then make it work within your skin. All you need to do is use the control provided by mojoPortal.
The Google Plus button allows your visitors to share the current page with those in their Google Plus Circles.
The Tweet button allows your visitors to tweet a url for the current page.
The Facebook Like button allows your visitors to "Like" your page.
All of these can be set so the url shared, tweeted or liked is static. This is more helpful on the Like button than the others because usually you'll want your users to "Like" your homepage or your Facebook Page.