If you've been stalked or harassed by an individual, sometimes all that person needs to do is remind you they still exist, and a whole flood of emotions can resurface. Poking can definitely be harassment just like calling and hanging up, or leaving "anonymous" notes. These are all just actions for the abuser to continue to assert their control over the victim.
However, just like girls who dress slutty, this person with the facebook profile was clearly asking for it. If someone is harassing you, the first thing you do is make your profile private (and defriend them). If your neighbor is peeping on you, close the goddamn curtains!!!