Unfortunately, the Google +1 or Share tracking feature seems to have been removed by Google. Their documentation still shows that the ability is there to use a 'callback' when a user shares content. That callback calls some JFBConnect Javascript which then is used to reward points.
However, just because their documentation shows it as possible, doesn't mean it actually works
There are multiple posts in the Google Developers area of this functionality not working. It hasn't in some time (since around the end of 2017). We have left the functionality in because a) it used to work and b) we're hoping Google fixes it. They haven't made any announcements that the ability to track when a user shares (or +1's) something has been removed, so we've been going on the hope that it will come back.
Google isn't putting a lot of development effort into Google sharing features, which is a shame, because it means things can break for some time before it's either fixed or removed entirely.. and we're never sure which way it's going to go.
For reference, here's some other developers discussing the callback functionality not working:
plus.google.com/100777000102386183098/posts/KriFEJHRNnh
plus.google.com/110831685157127838096/posts/WC8NXMtpcaL
Sorry I don't have a more definitive answer for you, but I hope the above explains what's going on.
Thanks,
Alex
Points system not working on google+ share
