[Rumudiez]

> an app whose primary motivation is offering a comment section for websites that don't normally have comments

Disqus has done this to a fairly wide extent. They allow site maintainers to moderate comments IIRC.

[jaredsohn]

I think this is more about something like running a chrome extension to have comments without the site owner's involvement.

https://www.google.com/search?q=chrome+extension+comments+fo...