What are these 4 icons in peoples posts?

[-DEADLY SUSHI-]

What are these four icons on the lower left-hand side of posts? What do they do? I know what they say if you put your cursor over them, but STILL.... what do they do?

 

[Dove]

I don't know either Sushie...do you think our computer will blow up is we click on one??

 

[Alix]

Check out this thread.

 

[Dove]

Thanks for the heads up Alix. I guess I must have missed that thread.
Marge