How to add all users to a Facebook group at once?

Question

Facebook

I found an article https://habrahabr.ru/post/194990/
But the script does not work. Are there any working ways to automate invites?

Answer 1

All found a solution. Bypasses limits.
hackingtryx.blogspot.nl/2015/05/script-to-add-all-...

Answer 2

If I'm not mistaken, there is a limit on memory for 50 users. So it won't work for everyone. The same problem for facebook will be serious if there is such an opportunity. But you can simplify this fifty dollars. Used a browser extension.
look here:
https://chrome.google.com/webstore/search/invite