Trending is currently broken and isn't working as intended, the web team thought it would sort itself out in like a week after the last update, apparently they were too optimistic and they are presumably aware of this and are presumably going to fix it the next time a site update rolls around.
...Hopefully. It's a pretty important part of how the new site works, and I know I've had ideas for threads but I didn't want to invest time into writing them because without Trending, there's nothing stopping them from getting swept off the front page by spam.
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Totally agree with the last half of your post. I'd really like to see the return of the sidebar with all of the "Top" topics. But as for now, you couldn't have put it any better by saying there is really no point in posting good threads because they are immediately swept away.