I have noticed personalization feature of TailRank is hidden for some time. The personalization feature used to be called local view in this service. In my early days trying this service, local view is my start page of the site. It’s in this address:

http://tailrank.com/posts/depth/local

As of this writing, the link is still work, but hidden from the homepage.

Why tailrank is doing this? Is this the performace issue? I do feel tailrank a bit lag in early days. And another personalized search engine Searchfox seems never out of beta because of scaling problem.