AddThis, which offers social sharing widgets for websites and blogs, offers a services directory that not only lists all the existing bookmarking sites in one page but you can also compare which services are most popular between two countries, or overall across the globe.
Are you looking to add a social bookmarking and sharing widget (button) to your blog or website? Read this comparison to understand which social widget is perfect for your site.
If you ever wanted to know how people are storing or sharing content on the web, this graph says this all. It shows a list of most popular social bookmarking services and tools that are used by netizens to share or save web pages.