This document discusses social bookmarking sites and their benefits for marketing webpages. It defines social bookmarking as sharing webpages, articles, images, and videos on social networking sites so others can easily find and view them. This exposure can drive traffic to the bookmarked content. The document then lists the top 10 US social bookmarking sites according to domain and page authority scores. These sites include Digg, StumbleUpon, Delicious, Reddit, and others. Bookmarking on these high-quality sites is free and can help increase a webpage's search engine ranking and exposure to large audiences.