The more votes a link have the more important & intriguing the web page is.
Better than spyware: One of the most popular basis for the existence of spyware is the expertise to spy on buyer surfing habits and to amass a client profile. Employing this profile dealers may display ads that are in close relevance to the customer's tastes.
In social bookmarking web sites, the clients themselves unawarely generating their own profile. By casting votes for a website and news item, the customers stating "This is of taste to me". The number of votes indicates the buyer's interest & thus helps in building his profile.
The polling history (diggs) is presently widely accessible in most websites. You may simply browse all the write-ups by very easily going to any client profile. That will give you the ideal picture of buyer interest.
Few of these websites attain privacy policy noting they will not market confidential information, on the other hand there is no privacy program and they are unobstructed to carry out whatever they wish with this valuable information.
Large web search engines & big portals which may collect this kind of confidential message are under heavy general public scrutiny respecting a safe guard of this type of data, but still social book marking websites stayed under the radio detecting and ranging.