Speaking about stalk...... I was friends with this one dude that went through all my facebook pictures at one point and liked/commented on each one.... That freaked me out! #blocked...
This is how people define stalking nowadays?
I have done the same as you have noted with my mother, sister, brother, and old friends I have re-united with.
What is the point in posting the pictures if it isn't for people that take an interest in you and your life to enjoy?
Showing more interest in you than you preferred without it being communicated is not stalking. Stalking is when you communicate that you would not like contact and the person persists. I have experienced this and it is very intrusive.
I'd bet that if this person was someone you really liked, you would have been giddy and excited that they took notice in you.
I am not picking on you, but it is troubling to see someone with so much senseless fear because I know it holds you back from your full potential.