Have a look at the tab named "reputation" in your user profile. However, only the most recent activity can be seen, it does not allow to look into the past as it was possible in the "old SCN".
Thomas is right. In your case, visit http://scn.sap.com/people/kamba.dasan/reputation. This will show you where and why points were assigned but not by who: this last part is private and anonymous.
Not entirely correct, the helpful and correct answeres are usually assigned by the person starting the discussion and yoy can see who liked the post by clicking on the number beside the 'like'.
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