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.
Please check our social widgets you can use: http://widgets.jotform.com/category/social
Let us know if you need more help.
I did but which one allows social sign in?
I do not think that this could be possible since you would be asking your users to sign in and provide their credentials, something that is not allowed on JotForm.
You are only able to use the widgets provided above on the previous reply.