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I don't think this is correct.

? is an attempt at using a RegEx in Robots file which I don't think works.

Further, if it was a properly formed regex, it would be ?

• is a special character for the user agent to mean all.  For the disallow line, I believe you have to use a specific directory or page.

http://www.robotstxt.org/robotstxt.html

I could be wrong, but the info on this site has been my understanding from the past too.

If users are sticking around on your site, adding comments, and engaging more, that data is tracked through tool bars and chrome on google, that equates to a better UX and better scores.

The conventional wisdom is that Panda is updated every X days, but that is not to say that other metrics that Google has aren't included in a more real time manner.

If you just added comments to your site, that is good for your users and you will thus get more SEO etc in the long run anyway.