Comment on SEO Super Comments WordPress Plugin by Mark.
I do think Hovercards are a nice feature if it is made SEO. The Hovercard I was using was the one from Jetpack. It does not matter, but I figure the official WP hovercard plugin in Jetpack would might be the best as they keep it up to date and working.
I think I can get commenters to use it I design my site that way (I will show you if I can get it all working how it looks). I will give them some Gravatar invitations and show them examples.
As mentioned I have experimented with larger social networking plugins and they are good and work with Stallion, but they are huge, adding complexity and tables to the database and not as SEO friendly, as pure Stallion alone.
Hovercards is much more lite weight, and I suspect people will check out someone’s Gravatar more than they would ‘register’ and go to a profile page.
If you actually click on a person’s Gravatar link it opens a new page, while your website remains open in the background, so it does not affect time on site, except in a positive way (if that is a factor).
Thank you for looking into this an replying in detail about Hovercards, check out the JetPack one by the way.