AddThis offers online tools that leverage data from our network of 15 million sites. We help publishers understand their audiences and drive traffic to what matters. They are most well-known for their Share Buttons, but their tools also include follow buttons, related posts, list building, and link promotion. Formerly known as ClearSpring Technologies, they have been helping publishers and brands weave a more personal and social web with their sharing tools since 2006. With a proud history in social tools and analytics, AddThis is about more than just social. They arefocused on providing powerful, easy-to-use consumer engagement tools, APIs and services for advertisers, publishers and brands.