Unlikely to normal bookmark, services like Deliciousand Technorati, let users ‘tag’ keywords to links as well. This social tagging services allow a tagged link to be made searchable for specific words and word combinations, available through directory like lists or ‘tag clouds’. Searches can be set as RSS feeds and sent to your RSS reader be used to publish searches and feeds.
Another social service is called social search, in which the process can help to winnow down the wheat from the chaff with results are considered ‘more relevant’ than a search engine’s algorithm because the results are hand picked. Some services like Eurekster and Rollyo for example can assist you in creating a personalized/shareable search engines based on your own set of criteria. The subjectivity that ordinary search engines lack is one of the factors that appear to keep these services popular with their users.
On the SEO and marketing side, could this tagging, bookmark, and search service be of use in promoting your website? The answer is the fact that a link back to your site from these services can gain you some small or large amount of traffic. If some one find your bookmark or tag from one of those sites and points back to one of your pages, this surely pass benefit to you. You may find a way to gain more benefits if you take part in some of those social networks in a meaningful way, even if you are not taking part for traditional rankings, link gathering, or other reasons.