Comments Plus displays wrong image on Facebook

When I enter a comment using facebook login, the image that appears on facebook wall is a button image. I tried activating Facebook Featured post image widget inside the comments plus plugin but that only displays Featured images and I don't use Featured images but all my posts have images placed inside the content.
Do comments plus have the ability to pull the post image? Does it require a simple coding in the backend so that it pulls not featured images or wrong images but images from inside the content. It should be easy since native FB comments box works like that.