In reply to Knut Sparhell.

Thanks for the thoughtful comment and it makes a lot of sense.

The Google+ Authorship banner is a little piece of "flair" that is added when linking your WP account to your Google+ account. It is enabled on this post above. Some folks don't like it, so it is optional now.

Twitter Cards are discussed more here: https://dev.twitter.com/docs/cards
Basically, when you click on a tweet and it has more to it than just the tweet, that's how.

With Infinite Scroll, we've made a lot of enhancements, including making it less of a resource hog (loads new posts only within two screenfuls of the bottom instead of within the bottom 25%, which got kinda crazy if you scrolled down a few times, etc). I'm not sure if it will fix your specific problem or not.

Can you try it and if things are still amiss, send us a note at http://jetpack.me/contact-support/ ? We'd be happy to check it out.

Thanks again for the comments. Cheers!