Sharing or Bragging?

When does sharing happy news turn into bragging? Is it the way the news is presented? The frequency??

I don't consider myself a bragger. I usually try to keep good news to myself, unless it's people I know truly genuinely want to hear it...like my mom and dad. They always like to hear my good news--about myself, the kids, etc...

But the rest of the world?

I am very active on Twitter and I post on Facebook too. I use them as promotional tools and do often share happy news about my career and my personal life. But I do try not to post more than once. Often I feel as if sharing my good news is rubbing it into the faces of others who may not have what I have. I know how it can feel to hear good news from others and it be a reminder of the things you don't have. And I'm not just talking material things here. For the most part I am able to be genuinely happy for others...but there are some who seem to always share the same news over and over.

So what should you do with a bragger in your life? How can you share your happiness with the world without others thinking you are a bragger?