As for distraction hazards, I have often seen links to TvTropes been posted with a warning sign, both here and in other sites. (Sometimes a plain "Warning: TvTropes link", sometimes a more teasing "Warning: do not click link unless you have hours to spare today".)
I wish links to Cracked.com also had a similar warning. (Well, now that I have LeechBlock installed that's no longer so much of an issue, but still.)
If it's worth saying, but not worth its own post, even in Discussion, it goes here.