Social bookmarking has its own advantages. There are several advantages over traditional automated resource location and classification software, such as search engine spiders. All tag-based classification of Internet resources (such as web sites) is done by human beings, who understand the content of the resource, as opposed to software, which algorithmically attempts to determine the meaning of a resource. This provides for semantically classified tags, which are hard to find with contemporary search engines.
Social bookmarking has some disadvantages too.It can also be susceptible to corruption and collusion.Due to its popularity, some users have started considering it as a tool to use along with Search engine optimization to make their website more visible. The more often a web page is submitted and tagged, the better chance it has of being found. Spammers have started bookmarking the same web page multiple times and/or tagging each page of their web site using a lot of popular tags, hence obliging the developers to constantly adjust their security system to overcome abuses. Because of this, some social bookmarking websites were forced to add CAPTCHA protection against spam, which caused some problems for people who use social bookmarking for non-spamming purposes.
Some Social Bookmarking web sites.
1) Blue Dot (Now Flares)
2) BookmarkSync
3) Cloudytags.com
4) del.icio.us
5) Digg
6) Diigo
7) Furl
8) GiveALink.org
9) Ma.gnolia
10) Newsvine
11) reddit
12) Simpy
13) My Web
14) SiteBar
15) StumbleUpon
16) thoof.com/
17) fark
References:WikiPedia





