i want to track clicks and country for a certain wordpress blog post – how ?

this is the question bothering me from quite some time. but yet i havent found an answer.
basically i want to hire people who have facebook pages. they will share my blog links on their site and in return they get paid according to the number of clicks or amount of traffic.
i would also want to see from which countries are the audiences coming.
if anyone could tell me how can i do that. i would be so thankful really.