Looking at your main page, I don't see a twitter:image tag in the source. To add a default twitter:image tag, please add one to the JFBConnect backend > Open Graph > Configuration > "Defaults" setting. You can do
To add an og:image and a twitter:image tag, or you can do:
image=FULL_URL_TO_IMAGE_HERE
To just add a twitter:image tag:
twitter:image=FULL_URL_TO_IMAGE
After you make that setting change, run it through the validator again and let me know if you have any issues.
We updated the Twitter Card settings in the latest release, but it still needs some clean up in 7.1. I can make a note to make setting the twitter image clearer.
-Melissa
Twitter Cards
