Multilingual Comments on my website

I have a website which contains description, title, cover of movie or some other things. On the bottom I have Facebook comments.

I have a 2 questions.

Should I change Facebook comments to Disqus comments?

Comments should be universal or separate for each language? (website Available in English, Armenian and Russian, should I separate comment block for single entity, let's say movie or all users should see all comments about that movie and be able to discuss in different languages?)