Copying Alex's response to your Contact Us here:
cURL is required for JFBConnect. I'm not aware of PHP removing cURL from php 7.3.7 and I do not think that's true. If you're upgraded PHP, you may need to ensure that cURL was included in the upgrade.
I hope that helps, but there's not so much we can do about this requirement as cURL is how we make connections to the social networks for authentication, fetching settings and many other features in JFBConnect.
For your info:
1. When I activate the JFB-files the next warning is shown:
JFBConnect requires the CURL PHP extension to be installed and callable."
2. Looking into the PHP-files of the Joomla site "under systeminformation" / "PHP information", cURL is not present.
3. I have to go back in the PHP version, but it may in the future, when cURL will not attached in the new PHP-versions anymore, cause a problem for SourceCoast.
Can you point us to any information about where cURL will not be available in future PHP versions? I've never heard of PHP doing that, don't understand why they would and can't imagine a suitable replacement for PHP without cURL.
If it's really being removed, we'll gladly investigate and determine the proper course of action. However, I think there's a misunderstanding somewhere about cURL on your server and the version of PHP you're trying to use.
If you have any details though, please point us to it as we'd love to learn more.