TL;DR: subscribe to topics of interest if the Active Topics section fills up with things that don't interest you.
...and this is a dangerous place to go, because to some it may sound like "Jolla: pay or get out", and I don't think that Google/Samsung/Apple/Intel are paying despite the fact that there are a few dedicated Android/Tizen/etc. threads not to mention all the comparisons that are made (for better or worse) with their products.
An option to hide (blacklist if you wish) traffic from selected sections