Social Bookmark - Social bookmarking is the practice of posting links to articles and webpages to various "link aggregator" or social bookmark sites, such as Digg, Stumbleupon and so on. Social bookmarking sites rise and fall in popularity fairly quickly, but they generally have several common features:
1. Users can submit links which other users can browse, providing a good way to expose your content.
2. Links enter into large pages of lists, that are normally very easy to navigate, and tend to be usually divided up into a "main page" of the best links during the day, and various sub-sections which help one to get exposure in relevant circles.
3. Links normally can be "voted on" to determine which links get more airtime on the front page of numerous sections. The more votes your links get, the greater traffic they get.
4. Some sites, like Digg, fasten a weighting to certain actions and users, so a person who submits more popular links will have a vote that carries more weight.
5. Most social bookmark creating site users are fairly jaded in terms of the internet, and will ignore things that aren't interesting, funny, or very entertaining. This is simply not a place for your boring pr announcements.
6. Most bookmarking sites usually have some kind of "social" element in their mind, allowing users to create profiles, have a friends set of other users, etc., in the hope of getting users to talk about content between themselves.
Social Bookmark - These are the basics, so let's have a look at how best to approach social bookmark submitting. I'm going to use Reddit and Digg as my main examples, having said that that Reddit itself takes a great deal of familiarity with its culture until you are able to submit links that anybody even clicks.
Choose your niche
Submitting articles on growing bonsais to the front page of Reddit won't get you anywhere - you'll get 30 visitors maybe, none who will buy your products. But submitting it to /r/bonsai, even though it only has around 1,100 readers, will most likely garner you more attention from interested people.
Ironically, submitting to /r/trees could have much less of an effect, because /r/trees is dedicated to marijuana culture. The lesson here is: know your subreddits.
Write an appealing title, and use a photo
Standard newspaper/advert headline formats don't work too well on the internet, because everyone has become immune to them. Instead you should think of a clever title that interests people enough for more information about what you're writing, or at least promise pictures of cats.
Most bookmarking sites include a thumbnail from the page you're linking to, or one you provide. Go ahead and take trouble to do this - it generates greater click throughs.
Keep at it, and make your links easy to share
Social Bookmark - Social bookmarking is focused on persistence, so if nobody clicks on your first link, make another article, think of a more clever title and check out again. Put a social bookmark submitting widget on your blog or website, and encourage people to share with you your articles. If you've submitted them already, and the've accounts, it only takes an additional to click an "upvote" or "like" button.
If nothing else, having links to any or all of your articles on half dozen social bookmarking sites is great for SEO.