Hi there, glad you like the plugin!
It’s exactly as you’ve described above. For most platforms, one share of a link equals one number. For example, on Twitter each tweet or retweet which contains your post URL counts as one.
For Google Plus, the number also includes people who clicked “+1” on a shared link.
For Facebook, the number also includes people who clicked “Like” on a shared link, as well as the number of people who commented on a shared link. (No other numbers like impressions are used, just shares + comments + likes).
Let me know if that info helps or if I can provide any more clarification.
Is there a way to only count one action on Facebook? i.e. Only shares or only likes?
There is not currently a way to get the individual numbers for just “shares” or “likes” or “comments” from Facebook. There used to be a way, but it seems that Facebook removed that functionality in their new API.
If anyone knows how to accurately retrieve the individual numbers from the API please let me know.