What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I cloned your form to test the Facebook embed and it appears to be working fine on my end:
Usually a 500 error indicates an internal server error or a general issue with connecting to the server. My recommendation would be to clear your web browsers cache and history, then try the integration once again. If this still does not work, I would recommend trying a different web browser other than internet explorer. Google Chrome tends to work the best with our form. If this also does not work, let us know and we will be happy to look into this further.
Thank you for using Jotform!