|Archiving status||Not saved yet|
Disqus is a comment hosting service, apparently by far the most popular one, apart from Facebook. They claim hosting 50 million comments per month, and recent comment IDs in threads suggest that the total number of comments exceeds 4 billion (as of August 2018).
Disqus was founded in 2007 as a startup, and was acquired by Zeta Global in 2017. (Worth noting, as startups are often subjects to, and acquisitions are often signs of, upcoming closures.)
Although Disqus threads can also be read on disqus.com, they should be saved along with the article they belong to. However, 750,000 websites (mainly blogs and news websites) had Disqus already back in 2011.
Even if we find the method to archive Disqus threads, discovering all the websites using it and saving all those articles wouldn't (won't) be a simple task.
A sustainable approach would be continuously achiving major news websites that use Disqus, with a focus on also archiving the corresponding Disqus threads. This is the aim of the recently started News+C project.