Wish the map had hover - tell me where they are coming from. My geography is not good!

Sorry! It's just a screenshot of the analytics app (Clicky). Maybe next time I'll whip up something more dynamic.

I just wanted to see my dot :)

Be mindful also that this is reflective of the time of day the post gained traction. I'm always surprised by the number of fellow Aussies (though I'm now in London) who read HN - no clicks here represents the fact that the post was submitted about 4 hours ago ... 3pm London time; 2am Sydney time.

what does the blue dot represents?

It means 2+ actions, while red is 1 action. So they probably clicked a link on the page after reading.