Like or no like?

Recently, I have been thinking about this...

"What makes you like a picture on Instagram?"

A. Is it because the picture is good?
B. Is it because the picture touches on an area you're interested in?
C. Is it because you sympathize with the person who has no 'like' for his picture?
D. Is it because you want the attention of the person who posted the picture?
E. Is it part of returning a favor, as the person has just liked your picture?
F. Or I just like every picture on my news feed.
G. Or perhaps I just want to annoy the other party by liking all their pictures at one go :P

Then, the next question will have to be this...

"What makes you not like a certain picture on Instagram?"

A. The picture is plain ugly?
B. I couldn't be bothered about what's happening in that person's life. (Then I'm curious... Why bother following the person then? lHmmm.... Let's not go there)
C. I'm too shy to make my presence felt.
D. I don't want to be labeled as a stalker.
E. My fingers are tired... I only like the first few pictures that appear on my news feed.

Again, all these options are just thoughts to my curious mind...
If we are able to find the reason behind the human behavior of voluntarily (for most cases I believe) liking a picture, could we also trigger other behaviors? Are human beings then easily susceptible to the manipulation of other human beings?