Last September I was on a panel with Guy Kawasaki talking about Twitter. He said at the time that he Tweeted 4 times for every story that he wrote. FOUR TIMES! The exact same Tweet. I couldn’t believe it. His rationale was that he found that his audience was tuning into Twitter at several different times during the day and he found that four was the optimal number to convert enough of the people reading his posts into traffic back to his website.
I asked him whether he was worried that he was turning off potential followers who didn’t want their streams flooded every day with Guy Kawasaki Tweets. He argued that anybody who followed enough people wouldn’t really notice much of a difference and if they followed so few people that they were significantly flooded then they were the wrong followers for him [on this point I'll never agree - I strive not to overwhelm any followers]. At the time I had a small enough group of people I followed that if anybody was in overdrive on posting for a day I always noticed (as I pointed out in Point 2 in this post).