Quora: It's appealing that it exists in English, French, Spanish and German. Writing in Spanish there could be good language practice for me. I often find good answers about languages and language learning there.
Reddit: They have subreddits for all kinds of topics but it looks chaotic and not so appealing to me.
Wikipedia: Who doesn't use Wikipedia? I often find topics that don't have a German Wikipedia article. Or details are missing. So, sometimes I think I should add the info or write an entry.
Wiktionary: One of my favourite tools for language learning. I mainly use the English version because there are many gaps in the German one. Sometimes a word doesn't even appear in the English version and I use other language versions, provided I can decipher them.
An advantage of Quora could be that I could write articles under my full name and in the case of Spanish it would also really add to my language learning. The advantage of Wikipedia and Wiktionary is that they're well organised and have a massive outreach. But authors of the articles remain anonymous to the greater public and others can change what you wrote.
So, which of these websites do you use when you're looking for infos and do you have experience writing on any of them?
I've used Wikipedia to read for the info though like you said anyone and everyone can write there, so, there is a lot of mistakes on there, at least from what I've heard...My brother writes articles for Wikipedia (and IMDB) and corrects them too. He sees it as a great way to get information out there. So, even if it is anonymous, it is a way to inform and help others, he seems to love that.