This is especially true if the content itself gives authoritative or complete information about something, as Warnock's dilemma (https://en.wikipedia.org/wiki/Warnock%27s_dilemma) described:
""" The problem with no response is that there are five possible interpretations:
* The post is correct, well-written information that needs no follow-up commentary. There's nothing more to say except "Yeah, what he said."
* The post is complete and utter nonsense, and no one wants to waste the energy or bandwidth to even point this out.
* No one read the post, for whatever reason.
* No one understood the post, but won't ask for clarification, for whatever reason.
* No one cares about the post, for whatever reason.
— Bryan C. Warnock """
In this way, I think the voting system became popular, not only because it's usable a mechanism to select interesting information, but also gives an important feedback to encourage the poster, same for the "Like" button. However, they has their own problems.