Another remark:
What if users would like to see mestakes made by others and also see corrections. It may be usefull for them (at least for me).

And, by the way, whay do you write either in Russian and in English? I suppose all of RF-users can understand English speach (or texst).

I've got an idea: those who arn't Russian natives but can write in Russian quite well should write in Russian; Russians should write in English. It'll help us to improve our capacity in foreign language.
So what d'you say?
The reason that I wrote my last post both (I think this is what you meant) in Russian and English is that I wanted everyone to understand what I wrote. Someone who has only just started learning Russian will definitely find my post useful. I also wanted to practise my English and get my mistakes corrected. And it's good for everyone to have a bi-lingual translation because they can compare what I wrote in Russian with what I wrote in English.

Your remark is very valuable! I agree that others will also probably want to see, for example, my mistakes.

In my opinion, your last suggestion isn't as good as the first. I'm sure that all Russian learners (and especially those who have a good command of the language) find reading posts written by Russians extremely useful. And vice versa. English learners find posts written by English native speakers very useful.