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1. Hootsuite.
2. Google /Twitter /Pin/ Y Analyitcs
3.Facebook Insights.
4. Klout score.
5.Keyhole.
6. Instagram ....
I concur with Yessaad Mohamed El Amine Amine and in addition to that i think it depends with which media site one wants to monitor and to some extent some tools are best suited for certain sites and some for others.
And so many more....
Take a look and find what suits you.
In summary :
facebook is best way to calculate social media monitoring