(Reposting)
Sorry about that -- those are actually test notifications that should not have gone out in the first place, and since we recently rolled back some changes, they went out again. Oops. Don't worry, they are dead links.
Original post from Bear Hat Alice (one of our engineers):
[{quoted}](name=Bear Hat Alice,realm=NA,application-id=cIfEodbz,discussion-id=F777ycva,comment-id=0008,timestamp=2015-05-15T01:13:56.911+0000)
Hey guys, this was us accidentally pointing the notifications service at a test environment. We rolled that change back, so it should be back to normal (if you had notifications, they should be there again). This was not a hack.
Post here if you have any questions. Thanks, and sorry about that :x 