According to this article on Yahoo, you sure can be!!
This seems like it might set some sort of precedent and I can only imagine that this is only the beginning. As a blogger who like to share my own insights about my personal experiences with certain products, I definitely worry about this a bit.
It seems that as long as the review is based on fact and personal experiences, you will not lose a suit but at what financial expense? What's there to stop the threat from big companies with a lot of money behind them from threatening suit? Not sure....