Disqus

Pros: It is easy to integrate this comment platform into a website, but better competing products are just as easy to integrate.

Cons: Extremely opaque about how they harvest data and resell it to 3rd parties. VERY confusing to users to see this and the associated T&C and opt-outs. Anonymous posting is possible, but requires the user providing an email address (again, very confusing to users).

Overall: If you have a personal site and don't really give a damn about user privacy, sure - this is an easy solution. If you are business of ANY size, just steer away. There are competitive products that give your users a better experience, and are more upfront about privacy issues.

Pros: It's an excellent tool for any business website. It turns the user into a regular visitor. Easy to implement on websites and gives the opportunity to build a better community.

Cons: Overall it's an outstanding platform for community development.

Overall: It's an excellent tool for community growth. Overall I use Disqus on my website to give users to contribute and help other users on the community. It makes the user feel engaged and solve their problem with other uses.

Pros: - It is literally so easy to use Disqus. You don't even have to go through the annoying login options. It is also quite simple to set up in your site.

Cons: - Disqus used to be free but they started putting ads on their basic version all of a sudden without telling anyone. The pricing model is quite prohibitory for simple blogs that don't earn much.

Overall: I think Disqus is the most popular tool out there to set up commenting on your site. It is also quite easy to moderate the comments.