According to comments recently made at G-Saudi Arabia, Google is planning to add SEO weight to comments made in Google+. This is part of their efforts to position Google+ as an alternative to Facebook for third-party comment sites through the promise of potentially better Google search indexing.
Currently, Disqus and Facebook are the best known of the third-party commenting systems. The new commenting system will compete with Facebook’s, but will use Google’s unique network of services, allowing comments to be indexed with Google Social which in turn will affect results in Google’s search engine. Google Social also crawls Twitter and Facebook to incorporate results in Google Search.
How Comments Affect SEO
Normally, comments don’t show up well in search engine indexing, something Google knows. The Google comment system, which will almost certainly rival that of Facebook, will have deep links to Google’s network of services and websites, indexing comments in Google Search, and most significantly, the system will be available for use on third party sites.
Each individual comment, meanwhile, could have its own unique URL – something suggested by CNET – which would allow for more precise linking as well as each comment to be its own, separately indexed search result. Given the popularity of Google search, and Facebook and Twitter’s reluctance to allow the company to include their content in results, it looks like Google is planning to simply bypass them altogether.