addthis.com is a domain used by Clearspring Technologies which is an advertising company that is part of a network of sites, cookies, and other technologies used to track you, what you do and what you click on, as you go from site to site, surfing the Web. Over time, sites like addthis.com can help make an online profile of you usually including the sites you visit, your searches, purchases, and other behavior. Your profile can then be exchanged and sold between various companies like addthis.com as well as being sold to other advertisers and marketers.
More about Clearspring Technologies:
Clearspring Technologies is the leader in connecting publishers, services and advertisers to audiences on the social web. Ranked #1 by comScore, Clearspring’s AddThis platform enables leading publishers to distribute and track digital content such as web pages, widgets, and videos to social networks, bookmarking sites, blogs, and more.
Sites using addthis.com to track you: