News reader which you use to sync with google reader that you use with your mac. Worth a look for keeping up with all your student blogs and classblogs.
The Diigo app for android for some reason doesn't let you share links to a specific group. But you can share to a particular list. This is a list for NFPS I created so can eventually have the stuff transfered to the NFPS Group. You might want to subscribe to it in your reader for updates of cool stuff.