Youtube... little orange buttons in comments section?

[jgvfhfc]

Lately, I've been seeing these little orange buttons in the comments section of videos on YouTube.
People usually type "lol" or "fail" or "omg" in them.
It looks like they're a link type thing, so I don't wanna click on them.

But, what exactly are they?
And how do you type one out? (Meaning like the code or whatever)

[adamandthensome]

I think they're just tags, like on Twitter. If you click one it will take you to all the comments witht the same tag.
If you type hash before the word, it will go orange e.g. #LOL

Hope this helps!

[Intellectualcherries963]

What are they is just to emphasize common words. Often people could say on a funny video "LOL! What a fail!" Where the words Lol and Fail are describing the impact in the sentence.
EG: You watch a video called 'morda' Your response could be:
WTF? Omg! * blah blah blah *

On a video called Juliana Wetmore// What makes you different your response could be"
WTF/ Eww/LOL

On a FailBlog video your response would more than likely be "FAIL!" and a lot of people on game videos say "*object* FTW"