Alexandr yes this suggestion is comes most of the time and it's in bucket list of Sololearn hope fully it will updated.
PS you can fill your suggestion via in app feedback feature as well as via the mail at firstname.lastname@example.org
SoloLearn has 17M followers. There is an badge that is given for 50 questions, provided that at least 5 users will like each. It turns out that SoloLearn stimulates the creation of spam. 50 * 17M = 850M questions (if everyone wants to get this badge).
I think all the official documentation for all programming languages does not have so many topics.
It's a great idea if Knowledge base can be created so that people can refere to the old discussion on the same topic. It will be really great if sololearn team can introduce the same on their website.
I have started using this website recently and found a lot of irrelevant posts are done in the blog by users.