Login with Facebook account before using form

Is there any option where I can ask user to login with their facebook account before using my form?

Do you want to enable to users to modify your form or to create login form where user will first login before using your form? 

With JotForm it is not possible to create login forms. In case that you want to achieve that maybe you need to create some custom functionality. E.g your site will have JotForm embedded inside of site but no one can access it before login. This login functionality need be made additionally by some developer. 

In case that you want to enable that someone else can modify your forms inside of your account you can create subuser account and share forms with that users. To find out how to do it, you can read this article:

http://www.jotform.com/help/232-How-to-Share-Forms-with-a-Sub-Account-User 

Hope this will help. Let us know if you need further assistance.