when thought bubbles go bad

Politically correct?
Tactful?
Truth and grace.... together.
I suck at that. My family all agrees that whatever I say needs to be run by Johnny because I have this gift with the word-coming-out-of-my-mouth thing.
And because I KNOW that I have this challenge ability, I try really hard to keep it in.
This may surprise some of you because I'm what my mom likes to call a talker. (Why is this taking me so long to write.... oh yah, tactless).
Ok! So, I hear people tell me that I'm really hospitable (don't ness. believe it) or that I'm easy to talk to (ahhhahahahah), but when people say really dumb things on facebook, or worse to my face, I feel it....
It bubbles up....
Burns in my chest and my heart and then my throat.
I try to push it down and ignore it, and then I ask this horrible hypothetical: Is this something that SHOULD be said?
Uh oh! That blunt thought that I can't find the gentle way of telling just spills out.
Every time it happens, I lose ATLEAST half a dozen friends... aquaintances... respectable people that I HAVE to associate with.
I'm having one of those moments. The comments are piling up in my brain from the past couple months and they desperately want to come out.
How do you stop? And what's funny is that I realized that a couple of them were telling others to shut their yaps.
So hug me when you see me... tread lightly because my thought bubble is starting to smell ripe.