Alright, starting from "The navigat□r", I can tell that there is a decent amount of italiced text in here. piecing it together by hand would take forever, so I decided to view it in HTML, and piece out the italiced text this way. Piecing it together, I manage to get "HnBD□wamghd", which is 11 characters long. Now, that text by itself doesn't really go to the extra pages on a tumblr, but if I replace the square with an o, like the quirk appears to be, I get, well, this. http://vneihfsiaklhsd.tumblr.com/HnBDowamghd
Examining the html of this page, I can notice some text that would require some highlighting to see, as well as a hidden comment that has "c□□rdinates: 234234,4532452,2345234,24324", which now has me stuck. If you would mind sharing your findings on tumblr, that would be great.