Diigo is the #1 online service for annotating, bookmarking, archiving and sharing webpages, plus a lot more! It has won numerous accolades.
With free browser extensions and apps for Firefox/Chrome/IE/Safari, and mobile apps on iPhone/IPad/Android, Diigo enables you to collect everything, helps you remember, allows access anywhere, and makes sharing and collaboration easy.
The extensions below can be used alone to meet your specific needs, or together to do more for you. Several of these extensions can also be used without registering.