Out of curiosity, I clicked See Sample Newsletter on the main site. At the bottom of the page that appears there are several links like this:
Some of these links go to Youtube videos instead of the subscription pages that you might expect.
Is this a bug or is my browser playing tricks? My browsers, I should say, as I have got the same result on both Internet Explorer and Firefox, and I have cleared the cache etc.
(I get the same results doing the same thing from the TeX.SE site, so it's not just Mathematics.)
The newsletter page in question may be seen here.