Susann Stjernborg said
1 year, 6 months ago: I think all data showed within a Facebook page has to stored on a server with SSL. Let’s say you have a video stored on your own server and you are linking to it on a tab. Then you have to make sure the video is stored with SSL, otherwise I suspect you can’t see it.
Places like Youtube are SSL so storing a video at Youtube and using that to show on your tab works fine.
The different tab companies are probably not alike but many are probably storing all the data you need for your tab on their servers. And by now they are SSL or they would be out of business 
All data on every tab, if it is made through the third app companies or something you made yourself, has to be stored using SSL.
If you are creating a tab page through Wildfire or somebody else and add the code for an opt in email list, the opt in is just code, stored with the entire page that is probably stored with Wildfire.
If the opt in code is on a page you made yourself and store on your own server, then you need SSL storage.
So it is not just when the code does something to transfer data. The data itself that is shown on the page, backgrounds, html, photos, videos etc, all of it has to be stored with SSL.
And that is why it is so easy to use third party apps, you don’t have to worry about it, they do it for you