User blog comment:Xean/5 Tips to Improve Your Wiki's SEO/@comment-168424-20110816152139/@comment-13301-20110817160143

Yes, anons don't get WikiActivity, but many users think that the default page IS WikiActivity, and when linking to the wiki they put a link to WikiActivity instead of a link to the main page. I've seen lots of users linking to WikiActivity instead of to the main page when referring to their home wiki or whatever, so Google will end giving WikiActivity more rank than the main page.