Haha! I just HAD to respond to this topic! haha :)
I have always made sure I do not use God's name in vain by using His name directly or through slang. In fact, I'm very very strict concerning myself. However, I do have friends that do (even within the church), and, honestly, I cannot judge them.
Whenever I'm on facebook or another social networking site, sometimes I will say OMGoodness. I NEVER leave off the "Goodness" part of it. For the longest time I would say "Oh my goodness", but everyone understands OM to stand for "Oh my" and then I just add goodness to the end! It's an abbreviated form for me.
Anyway, I was just letting my opinion known. 
Raquel