Regardless of Interactive posts or the simple share/+1 button, I've been around the internet to find an answer for this question which actually works on PC/Mac/iPhone/Android browsers (FF, IE, Chrome, Safari).
I've found "data-onshare" property for Interactive posts to set a JS callback function but it only seems to work on PC browsers.
I'd like to know a code that works on iPhone/Android browsers. It doesn't necessarily have to be the same as the one for PC.
Thank you.