I feel this discussion was had way before me already. Though I thought I'd bring it up in a way of let's 'Take Vote' for or against, as opposed to just why we should or shouldn't have so features.
Like always feel free to also share your thoughts.
I feel:
Like/Dislike buttons creates positivity and negativity. Which I think the negativity can be avoided with these 'buttons':
- Hug - if someone feels down or you just feel like sending Virtual Hugs
- Me too/Agree - Need I say more.

- Disagree - It's okay to disagree respectfully.
After having had a talk with #I_am_Polylover about why we should/shouldn't have a like button, I had come up with the above. I was against (for a handful of reasons) about having a like button especially with a dislike as they usually go together. However, after hearing I_am_Polylover' perspective I support having a like button or similar - #1.