Seaching using the word "Feed the beast" or "Feed the beast wiki" on the internet does not show this site anywhere on the results. You might consider to make this site more visible.
However "ftb wiki" will list the site. Maybe something is up with the search tags?
This is something we can't help unfortunately, I've been doing everything I can think of to make the wiki easier to find, but due to the fact that Wikia is hosting the content we originally produced against our wishes, we have to compete with them, which is very hard considering that Wikia's pagerank is determined not only by the visits to the wiki, but also the visits to Wikia as a whole.