Do search engines index disqus widget comments?

Question

PHP

We are considering the option of integrating the DISQUS comments widget into the site. There are a number of questions about it.
1. Do search engines index DISQUS widget comments?
2. Does the widget allow comments to be moderated?
3. Does the widget have an internal rating of comments in the Like / Dislike format (like on vc.ru) or This solution (like on a toaster)?
4. Is this widget free or does it cost some money? What?
5. Are there alternatives to ready-made scripts or other services?