You've obviously got a big problem on content creation / content adding.
I clicked on "music" and the newest post is 14 days old, and it quickly drifts to 70 and 90 days old before you get past the first ten posts. "Tech" was even worse.
The posts go back about a year, which means in all that time you haven't figured out how to get fresh content on the site.
Aren't all posts at the moment from developers/beta testers? I guess they are launching the website now and that's when they expect to find new users/posts.
I clicked on "music" and the newest post is 14 days old, and it quickly drifts to 70 and 90 days old before you get past the first ten posts. "Tech" was even worse.
The posts go back about a year, which means in all that time you haven't figured out how to get fresh content on the site.
I'd strongly suggest you crack that problem asap.
Also, the topic page urls look like this: http://www.topic.so/t/32a14b833ff6a0e7013ff81a204d0042
That's a really, really bad way to structure urls on a content oriented site. Why isn't that topic.so/tech or /t/tech???