The escalating popularity and competition of different sites has extended the services offered to offer more than just sharing bookmarks, such as rating, the ability to import and export, add notes, reviews, email links, automatic notification, make comments, get feed subscription, web annotation, create groups and social networks.
The main downside to social bookmarking is that it can also be susceptible to corruption and conspiracy. Moreover, due to its popularity, some users have started using it as a vehicle to use along with search engine optimization to enhance their website's visibility. The more a web page is presented and tagged, the bigger would its chances of being found, and spammers have started bookmarking multiple times the same web page and/or each page of their web site using a lot of popular tags, which has forced developers to constantly improve their security systems to effectively filter spam mail and other abuses.
The major distinctive feature of social bookmark applications, however, is the social nature of their use, and currently there is a bias toward increased transparency in these tools, to prevent abuse. Although bookmark collections are personally created and maintained, they are typically visible to others. A number of user interface elements are configured to allow open browsing of the bookmark space.
For example, user names are "clickable" links; clicking on a name reveals the bookmarked collection of that user, and allows a web user to get a full idea of the topics of interest for a particular user, which are also visible to others.
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