http://spywar2hncz3lkteymwfy7s6qxalsvw37gc4bywcf6v2b5hzjnwt5tad.onion/articles/slimjet.html
Fpseek itself is a company that seems to be tracking how users interact
with advertisements and it says that it uses information it collects about its users to: "...maintain and improve the quality and operation of the Software & Services, including, monitoring viewability of and interaction with advertisements, search results and other products and services provided by Company." [3] So, it looks like your searches are sent to two advertising companies instead of just one.