Any browser that doesn't completely anonymize and secure browsing, social media, hosted email, any other applications that don't encrypt their communications, any network connection that isn't anonymous, any device you don't plan to ever re-use and that wasn't purchased with a traceable payment. I think that covers it, if you accept a couple dozen more assumptions that aren't listed in addition to the above.

The NPD Group, Inc. provides innovative market information products and services to help our clients understand their markets and optimize their businesses. We work with more than 1,400 clients - many of which are the best-known brands in the world.
http://www.npd.com/corpServlet?nextpage=career-overview_s.html