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I was wondering if you have a like button on the blog and people use it to like a post , is it possible to find out who all have liked the post ? ( there is a counter to show the number of people who have liked the post, but could not figure out who have actually clicked the like button )

Is there any tools available that allows users to track ranking of a keyword in SERP over time ? I know the question can be a bit confusing so here is an example that I hope makes it a bit easier to understand EXAMPLE : I am doing keyword research for say "iphones games" and I find out the current sites that rank for the term but If I want to see who ranked for the term 6 months ago or 1 year ago, is it possible ? Also can I get data of the SERP ranking history for "example.com"  for the term "iphones games" ? eg : in jan 2011 rank 10 feb 2011 rank 7 ... sep 2011 rank 5