diigo is a website where you can join little groups on things that intrest you. The groups are full of people that post websites and bookmarks for other people to see when they come to the group. You can also add an extention to your web browser so that way you can bookmark websites faster and easier. The extention allows you too add a webite to your read later slot and it also allows you to ad sticky notes so you can remember where you were at in the wbesite or you can highlight somthing if you need to remember it to take notes on if you have too.