AddThis is a social bookmarking service that can be integrated into a website with the use of a web widget.
Apache is a free and open-source cross-platform web server software.
Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
Open Graph is a protocol that is used to integrate any web page into the social graph.
PHP is a general-purpose scripting language used for web development.
Silverstripe CMS is a free and open source Content Management System and Framework for creating and maintaining websites and web applications.
Twitter is a 'microblogging' system that allows you to send and receive short posts called tweets.