Ask HN: Analytics: Hosted or Custom for my publishing platform

I want to add analytics to my application (I basically host Facebook Pages for users), so users can see how many users viewed and or clicked on their links.

All I really want to do is log views and clicks and display this to my users in their publishing dashboard. I can't decide if I should write something like this from scratch, or if I should use a service like Mixpanel to do it for me.

What would you recommend and what would the pros and cons of either solution be?