Thank you - This is the first rational explanation I've seen as to why a "Like" button should exist without a "Dislike" option. Personally, I have always found it socially degrading to only allow people to "Like" (agree) with things you post online for several reasons: 1. It turns online social interaction into a competition for acceptance 2. It gives others a much easier way to express agreement with something than it does to express disagreement and 3. It promotes the idea that we should only be exposed to positivity in relation to our thoughts, while shunning the notion of opposition.Well, that's the thing, there is a difference, unlike with disagreement, agreement often means agreement with the reasoning so there's really nothing to add beyond just something like "agree" or repeating the same reasoning as was already provided. And if there is, then someone could certainly post that actually adding something new/different. Seems like the "like" feature remained mostly in relation to that so that threads don't needlessly get cluttered up with "agree" posts that mostly either don't say anything more than that or just repeat the same reasoning and the same things again.
There are a number of discussions in the site and forum feedback section here about all of this with comments from the staff that go into more details and more explanations and discussions of it all.
As to how you'd avoid cluttering threads with "agree" posts, I really have no answer. But then again, why is it socially acceptable to agree with something without explanation, but not to disagree? Why is the threshold different for diametrically opposing viewpoints?