There are pros and cons to using a third-party blog comment system rather than using the commenting functionality built into your blogging platform. You should do a careful evaluation of each option before you make the decision to switch to a different system.
Following are overviews of the most popular third-party blog comment systems to get you started.
Disqus
Disqus enables anyone to publish comments on your blog posts using their OpenID, Disqus, or social login information. It offers a long list of functionality such as comment subscriptions, threaded comments, and the ability to add videos and images to blog comments. It is available to WordPress, Tumblr, and Joomla users.
In addition, Disqus offers reports so you can learn more about the people who publish comments on your blog posts. It works very well with mobile devices and includes comment moderation functionality.
It's an excellent tool if you want a better way of reducing comment spam and more information about your engaged visitors. Furthermore, if you want to keep blog comments synced and stored on your own blog database (rather than on Facebook or Google+), then Disqus might be worth trying.
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Livefyre
Livefyre offers social logins, images and videos within comments, comment subscriptions, threaded comments, and comment moderation like Disqus. Livefyre is available to WordPress, Blogger, Tumblr, Squarespace, TypePad, MovableType, Drupal, and Joomla users.
What sets Lifefyre apart are its very detailed, real-time reports on your engaged visitors. For power bloggers, a paid version is available, but the free version is more than adequate for most bloggers. All comments are synced and stored on your blog database, so your data is always yours.
If you want to reduce comment spam and closely track comments and your audience, then Livefyre could be the perfect third-party comment system for you.
The Facebook Comment Box can be added to any website. There is a Facebook Comment Box WordPress plugin to make the integration process easier. Visitors can publish comments on your blog posts using the Facebook Comment Box, like comments published by other people, reply to comments published by other people, visit other people's profiles directly from the comment box, and more.
If you rely heavily on Facebook to drive traffic to your blog and build your audience, then the Facebook Comment Box might be an excellent choice for you.
On the other hand, Facebook doesn't offer the depth of functionality that Disqus and Livefyre provide. For example, comments submitted through Facebook are not saved within your blog files. Facebook stores them. In other words, you'll have no comment archive if you use Facebook as your third-party blog commenting system. That means if you change comment systems in the future, you'll lose all of the comments that were published using the Facebook Comment Box.
Google owns both Blogger and Google+, so it's not surprising that the Google+ comment system only integrates with Blogger. If you're using WordPress, there are some plugins that you can test to enable visitors to publish comments on your blog posts with Google+, but there is not an official tool provided by Google for any blogging platform but Blogger.
When a visitor to your blog submits a comment using Google+, that comment will also appear on the visitor's Google+ profile (if the profile is public). Similarly, if a Google+ user publishes an update on Google+ with a link back to your blog post, that Google+ update will appear as a comment on your blog post.
If Google+ is extremely important to your blog strategy, then using the Google+ commenting system on your Blogger blog might be a good option for you to test. Keep in mind, Google+ is not even remotely as active as Facebook, so using the Google commenting system might result in a dip in the number of comments your blog posts get. Also, like Facebook's comment system, the Google+ comment system doesn't offer as much functionality as Disqus and Lifefyre, and comments are not stored in your blog's files. Google stores them. If you change your blog comment system in the future, all of the comments published through Google+ will be gone.
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