I have tried this plugin as I am using the same Twenty Thirteen but Child Theme with some customization. Features of Google+ and Facebook are nice, but I am having some problem at the moment by manipulating the width of this comment system as per my content page which is taking the full stretch πŸ™

As long as i can make some css changes that looks fine on Desktop platform but that breaks up on smartphone πŸ™ I have removed it for the time being, but I will try this up next time as it would take some to get it fixed πŸ™‚