Journalists generally don’t like exclamation marks. We believe that words alone should have enough impact in most cases.
However, I find myself using exclamation marks on a regular basis now that I’m blogging. Groan!
That said, there’s definitely a place for exclamation marks in conversational writing. I find myself using them mostly to convey excitement, especially when I’m writing about food.
Jicama! Cherimoya! Chocolate!
But only one exclamation mark at a time. I have to show some restraint!