I never understood why people use it either. I don't think its necessary for a person to know WHEN the other person read it. I just want to know that its been read, and I can tell either way. You can tell 'when' anyway, if you check message tracking often. The moment you notice it disappeared means its been read...and if you check pretty often, that couldn't have been too long ago.

I have accidently clicked on it, but I know some people always do it on purpose. I can't understand why, but oh well.