Question
Is it posssible to track WHO shares content in Marketo
When using the standard social toolbar in Marketo - for example:

Is it possible to track those known users who share our content with any of the social networks? I know we can view the number of times a page has been shared across the four main social networks:

But we're looking to identify WHO is sharing our content. After running a few tests, I'm not seeing any "sharing" information contained within the activity log.