For book/ebook authors, publishers, & self-publishers
I agree, Paul. I keep hearing about how wonderful "Twitter" is and it is pushed as a marketing tool by agents, publishers, PR for authors to interact, etc. But no one can present numbers or facts to show it works to increase sales. In fact, I posted a question on this forum about Twitter - but haven't received any answers.
I have enough to do maintaining my blog, website and other social forums, where I have seen tangible results, but Tweeting on 140 characters multiple times a day to attract attention? You can't carry on a meaningful conversation. Not to mention, I'm an author who must take time to write and not promote all day.
So until someone can convince me with facts about Twitter's success, I'll leave it off my marketing duties for now.