Its going to depend on what variables you have available. In your above example you can use that absolutely anywhere because the image is static.
But if you are looking at the top page then there is going to be no profile image selected so there would be no image URL for a profile because we are not on a profile.
So what you need to do is to figure out where that meta name is going to show at, then see what variables you have in that location.
The function to show you what variables you have to work with are found with {debug} in the template you're interested in:
Docs: "{debug}"
https://www.jamroom.net/the-jamroom-network/documentation/development/1477/debug
Probably you're editing the sharethis template for the module I'm guessing, so put the debug in there and look at the page you're interested in.