Exactly. Why can't the database guy add categories to his account (databases, politics, personal) and assign a category from his list each time he tweets? His f

Exactly. Why can't the database guy add categories to his account (databases, politics, personal) and assign a category from his list each time he tweets? His followers could choose which categories to follow. That would avoid alienating his followers, but still allow him to tweet on any topic he likes, knowing that only people who are interested in that topic would see those particular tweets. This would be better for all parties.