As stated on the wordpress.com support site:
“Some search engines and social sites provide additional tools or features when you verify that you are indeed the owner of a specified URL. In order to do this, you normally need to add a hidden “meta tag” to your page. Since you can’t edit the theme files of your site on WordPress.com, we provide additional tools to make this easier.”
If you haven’t done this step to your blog (like I hadn’t) start here: http://en.support.wordpress.com/webmaster-tools/
However, I thought I would share a couple tips I learned yesterday. The solution wasn’t as intuitive as I had hoped.
It is important that you choose “Alternate Methods”, and select “HTML” to get your verification code. The code in the red circle (no you can’t have mine) is what you paste into the google verification code place on your “Dashboard-Tools-Available Tools” spot. Also, wait a bit before clicking the verify button on the google webmaster tools site. 5-10 mins I think. Be patient.
Bing was a piece of cake.
Everything is on one page. Choose the meta tag option and copy the string in the red circle.
I can’t get you a screeny for Pinterest. Suffice it to say that you don’t want the code from the filename option. You want the other option. It will be a longer code.
So, just trying to be helpful and save my fellow writers and authors (oh, and others) some time and frustration.