Comments

Discussions on the site.
The advantage here is that a person who is not registered in social networks can leave a comment.
The code is embedded in Blogger, Thumblr, Drupal, WordPress ... or on a website.

Here everything is more serious, there is a control panel for comments, fine tuning.

Suffice it to say that this service is used by newspapers, TV channels, for example. TBN, CNN, Daily Telegraph and IGN.