Comments on articles/products on the site through social networks. networks

Question

PHP

Is there a stable ready-made system that allows you to connect to your pages the ability to leave comments without registering on the site, but using your choice of facebook / vkontakte / twitter account / maybe something else.

In the absence of such, what would it be possible to simply specify an email for example (i.e., not to create a user registration system on the site because of comments alone)?

Of course, writing it yourself is quite realistic, of course, but maybe something like this already exists and it’s not worth reinventing the wheel?

Answer 1

cackle.ru/welcome norms, I use it on two projects, although there are not many comments there

Answer 2

disqus.com/ great stuff, but no VK. For authorization, in addition to the login, there is www.loginradius.com/

Answer 3

Widgets for VK comments are connected by simply adding a few lines of HTML code, vk.com/developers.php