Social Bookmarking

Social Bookmarking
01.CiteULike

Search, organize, and share scholarly papers.

02.Delicious
One of the first social bookmarking sites.
03.Diigo
Highlight, annotate, and share web pages with this unique knowledge-sharing tool.
04.Evernote
Index and search text, images, and media clipped from local documents and the Web.
05.Reddit
Social bookmarking site with numerous subtopics.
06.Stumble Upon
Web site bookmarking and social discovery service.
07.Zotero
Firefox extension for collecting, managing, and citing resources.