Board Thread:Support Requests - Getting Technical/@comment-340-20160421160900

I've received a couple of strange alerts which purport to refer to the main page on one of my favourite Wikias. They say something like "See the latest changes made to «Main Page» on «Some Wiki» by «User»".

However when I follow the link (example) it doesn't take me to a "diff", but straight to the main page. Furthermore when I check the page history there is no change at the timestamp provided.

Three things intrigue me:
 * 1) what dies the "?s=wl" appended to the URL mean?
 * 2) why does the timestamp on the message I received sometimes correspond to the creation of a new user account with the name reported?
 * 3) why don't I get such an alert for all account creations, just some?  