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Cackle is one of the most popular solutions to create your website a full-fledged comment system.
Cackle


Cackle uses little resources in order to deploy a complete scheme of commenting on your project, thus your visitors can leave a comment or opinion, simply passing the authentication through popular social networks such as Vkontakte, Facebook, Odnoklassniki and many others.
This is a distinctive feature of this service is having only 1 account on any social.network, you can leave a response or review on other resource.
Can choose the providers and social services.the networks want to continue working, and through which your users will access in this system.
There is also a selection of plugins for specific CMS like Joomla, WordPress, etc.
Advantages
The ability to call in a commenting system with a whole heap of accounts.
Easy and quick installation through plug-ins.