This is often a Gravatar issue, and the person has changed their blog URL but their Gravatar is still pointing to their old URL. Chances are they don't even realize this is the case. Here's how to check if this is an issue for you: 1) In the WP app, go to "Me" at the bottom of the screen. In the browser version, click on your Gravatar image near the top right of your screen. 2) Go to "Account settings." 3) Find "Web Address" (below this, it says "Shown publicly when you comment on blogs." 4) Make sure the domain name listed here is correct.