When there is modifications in a dfwiki, "Recent Activity" show them (but when I click on "Full report of recent activity...", nothing appears about the dfwikis.
By the way, it should be interesting if we could configure the "Recent Activity" block (and some others) because it takes a big place (1024x768) to show only 3 or 4 informations. Perhaps change the space between the lines/paragraphs