Best analytics tool for measuring reach on third-party URLs

Hi,

I posted this on Black Hat Tools categories but figured that you, White hat guys, may have some input as well.

So I want to establish the potential reach of a set of third-party URLs.

Do you know a tool that can give me all the info on a particular URL (shares, links, likes, etc.) and an estimated reach / number of eyeballs on it? particularly if it can be broken down into country, i.e. UK

Thanks