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I would use alt tags to accurately describe the image. Google should be able to tell that an image of a human brain is closely related to cognitive behavioral therapy and will help add to the content and quality of the page. It might even look spammy to have "keyword stuffed" alt tags.
I've only worked with Facebook comments and Disqus. I started with Facebook and decided to move to Disqus. This was for a few reasons:
I came to find out that many people didn't want to use their actual name (personal facebook account) to post comments. Facebook comments restricts commenting strictly to users who have Facebook accounts: users are unable to use their Twitter account or post as a guest, ect. Disqus allows users to post from several different accounts including Facebook and as a guest. I just really am a fan of the versatility that comes with Disqus.
Hope that helps,
Scott
I really think it has to do with the age of the page and the freshness of the OSE index. Golfer's Advice was just posted yesterday (December 19, 2011) and the HP White post has been up for over a month (November 02, 2011).
One of the links to the HP White post the seems to be pushing the PA is a category link.
I'm pretty sure the Golfer's post has a category link as well but the OSE has not recrawled the category page since it added the link.
For example (add what is in bold):
You can also delete the empty title attribute (title="") since it's pretty useless.
Hm. I'm trying to figure out what exactly you're talking about.
If you go to this page: http://ndesign-studio.com/blog/best-wordpress-sites and do a search for "Laying horses" there is a link with that anchor text to this page: http://racingsecretsexposed.com/
Then it has to do with a combination of the age of the page and the internal linking structure of PRweb. Prweb structures it's posts so that they belong to categories. As more press releases are posted they move farther and farther from page 1 of the category (and get less and less PR from PRweb's homepage).
I haven't looked too deeply into this theory but I think it's a logical explanation.