Where are the Hillary supporters?

There is a meme going around stating:
“Have you ever seen any of your friends on Facebook posting support for Hillary Clinton? That’s what I thought. So explains to me how she is in the lead.”
There seems to be a bit of an overwhelming response of people saying that they know of very little people who openly support her, and I am noticing the same.
Sure, I see people who like Bernie, but will vote for Hillary in the general.

But, where are the true Hillary supporters?
Why do they seem to be lacking on social media?
Do flutherites know of many true Hillary supporters who voted for her in the primary?