Diigo

Diigo is two services in one: it is a research and collaborative research tool on the one hand, and a knowledge-sharing community and social content site on the other.

Diigo provides a browser add-on that can really improve your research productivity. As you read on the web, instead of just bookmarking, you can highlight portions of web pages that are of particular interest to you. You can also attach sticky notes to specific parts of web pages. Unlike most other web "highlighters" that merely clip, Diigo highlights and sticky notes are persistent in the sense that whenever you return to the original web page, you will see your highlights and sticky notes superimposed on the original page, just what you would expect if you highlighted or wrote on a book!

Moreover, all the information - highlighted paragraphs, sticky notes, and the original URL - are saved on Diigo servers, creating your personal digest of the web, your own collection of highlights from the web - ones that are meaningful to you! You can easily search, access, sort and share this collection from any PC or even iphone.

Besides, Diigo enables effective collaborative research. You can easily share your findings, complete with your highlights and sticky notes, with friends and colleagues. A project team, a class, or a club can create a group on Diigo to pool relevant resources, findings and thoughts together.

HiperLink: http://www.diigo.com/

Furl

Furl is a free service that saves the important items you find on the Web and enables you to quickly find them again. Furl archives a personal copy of every page you save. When you want to recall it, you can find it instantly by searching the full text your archived items. Each member has a personal archive of 5 gigabytes (GB), large enough to store tens of thousands of searchable items.

Furl recommends new Web pages that may interest you, guided by the sites you've already "Furled," or saved.

Furl also offers the best ways to share the content you find on the Web. Send a daily email newsletter of links to friends and colleagues, use Furl to generate RSS feeds for your links, or integrate them quickly and easily into an existing Web site.

HiperLink: http://www.furl.net/

stickis

stickis help realize the potential of a new, social, web to help you find, evaluate and share relevant web content with your personally defined social groups. Stickis are a part of your web experience: wherever you are, stickis are there with you, helping you create commentary, conversation and community.

Stickis make the web more participatory, augmented by your individual contributions and enriched by your communities, transforming browsing into a collective experience.

HiperLink: http://stickis.com/

Ma.gnolia

Ma.gnolia starts with making the social side of social bookmarking work better. With contacts, groups and different ways to share bookmarks both within and outside of Ma.gnolia, this platform makes working together on a casual basis or more formal projects fun and easy.

Bookmarks in Ma.gnolia are more than just entries in a database. Each one tells a little story about the websites that they help you find again.

HiperLink: http://ma.gnolia.com/

delicious

delicious is a social bookmarking website. The primary use of delicious is to store your bookmarks online, which allows you to access the same bookmarks from any computer and add bookmarks from anywhere, too. On delicious, you can use tags to organize and remember your bookmarks, which is a much more flexible system than folders.

You can also use delicious to see the interesting links that your friends and other people bookmark, and share links with them in return. You can even browse and search delicious to discover the cool and useful bookmarks that everyone else has saved, which is made easy with tags.

HiperLink: http://delicious.com/

Searchles

Searchles is the intelligent social search platform that gets smarter every time you use it. They take popular Internet tools like bookmarking, tagging and sharing content and fully integrate them with in-depth search features. This means that you, your friends and the Searchles® community can actually do something that matters — discover, connect, find, share, collaborate and discuss - rather than wondering, “Why the heck am I posting content on this site? What’s in it for me and my friends?”

HiperLink: http://www.searchles.com/

ScrnShots

ScrnShots is a tool that allows you to host and share screenshots of the websites you like. It's also a great platform for social bookmarking because it gives a visual look of the websites you are looking for and let's you tag tag them for easier search.

HiperLink: http://www.scrnshots.com/

Digg

Digg is a social news website made for and by it's users. Every time a user submits an article, that article is voted and commented by other users and, with a good amount of votes, it can reach the first page.

HiperLink: http://digg.com/

Simpy

Simpy is a social bookmarking service where you can save, label e search bookmarks and annotations. You can also just surf and find links and labels from other users. You can share your links with others or simply have them privately hosted.

HiperLink: http://www.simpy.com/

reddit

reddit is a source that indexes everything new and popular on the Internet. Your votes on other users submissions train a filter that allows reddit to learn everything about your tastes and choose the best content for you. All the contents found in this web service are submitted by you and other users like you.

HiperLink: http://www.reddit.com/

StumbleUpon

StumbleUpon helps you find and share great web sites. Every time you press “Stumble!” this tool delivers high quality pages related to your own preferences. These pages are recommended by your friends or some of the 5 million other StumbleUpon users.

HiperLink: http://www.stumbleupon.com/

Fleck

Fleck allows you to add sticky notes to web pages and collaborate in real time. Share your notes or add them directly too your blog. Fleck the web!

HiperLink: http://www.fleck.com/

Clipmarks

Clipmarks is a social bookmarking tool where you can save or search clips of text, images or video about all sorts of topics.

HiperLink: http://www.clipmarks.com/