Comment deletion by moderators can be viewed by moderators (or above, of course). However, for the most part comments are always subject to arbitrary deletion; they are not intended to persist nor to contain important information.
If you are concerned about a specific moderator action, please contact the CMs using the Contact link on the bottom of the ...
Examples that work:
(Some text before the URL)
This is Michael Jordan's Flu Game, the greatest basketball performance of all time!
Isn't he amazing?
(URL shortener - seems to work with the default one)
Examples that do NOT work:
(This has the link ...