What is the light bulb icon below my responses?

Question

Help please...I am icon-challenged.  

Answer 1

I have no idea! :) lol. Does it mean we are smart? :)

Answer 2

Well...it's dark, so...LMAO!

Answer 3

Lol So you're saying we're dim? :P lol

I clicked it and my post turned pale.  Maybe it makes your post either invisible or anonymous?  I'm going to click it in this answer and see.

Answer 4

It's supposed to mean you DO have an idea, haha

Answer 5

Its used to hide responses which are posted twice.

Answer 6

Ok. I saw that it hid my post. Couldn't figure out why I'd wanna hide it, but your answer makes sense. :)

Answer 7

Tyvm

Answer 8

Yvw :)

Answer 9

The light hides the answer to other users.

Answer 10

lolz   Icon challenged