Where I am getting traffic from facebook
 

In my analytics, some referrals are from facebook. How can I know where is link on facebook for my site from where visitors are coming?

Facebook is very nice way to increase traffic on the site. if you have given links on facebook site, it will be useful for your site to get traffic on the site. but facebook post should be relevant to your site.

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It is not possible to track that from where are you getting traffic from fb, most important factor is that fb keep streaming posts in front of user and the url of page where updates stream is just facebook dot com so you can not track the history.

Website traffic
 

Well, you should install analytics to track Facebook traffic, this will help you to track source & demographics so that you can better where the traffic is coming from on your site.

you can track it in GA with a custom url...