It's quite weird to see...
a Trending link over on the right to an old Table Manners column from 2008 about bringing your own plastic containers to work. How is a long-dead Chow column "trending" here?
There was a thread on that issue just recently. Trending is based on recs.
As explained when announced:
Somebody's recommending old comments, it seems. Of course, they did say they might be tweaking how it works, and we don't have all the criteria. Would help keep spammers from manipulating the site to some degree.