Social bookmarking websites allow people to keep their web bookmarks in one place (which can then be accessed from any computer) and share their bookmarks with other web users.
Some bookmarking sites allow users to rate links, with highly-rated bookmarks appearing in a prominent position on the site. These 'top links' will often attract thousands, or even millions, of visitors.
Social bookmarking websites are a good way of raising awareness, but few charity stories make it to the top. The ones that do generally involve controversy or celebrities.
You could use a social bookmarking site to draw traffic to your charity or social enterprise website, or to a media article that mentions your charity. However, it is only worth posting content that you feel is of particular interest or unusual. Examples of stories that have done well on social bookmarking sites include Rare 'Harry Potter' Fairy Tales To Be Sold For Charity and Is IKEA the World's Largest Charity?.
There are dozens of social bookmarking sites on the internet. Some of the popular sites include delicious, Digg, Diigo, StumbleUpon and FARK.com.