Oh yeah, "Optimistic" is used when someone says something that is not really true or possible, so it's like saying "keep dreaming" or something like that! hehehe
I like coming up with my own meanings for the ratings, like with the optimism one, I think of it as like hopeful, or like "you can do it" or whatever : p With the friendly rating (heart) I like to use it as like "aw poor you" or like "youre way nice, cheer up" kinda thing : p I like the heart the best, though I have the most fun with the agree/disagree ratings : p