Becoming visible is a challenge, but there have been some great hints here already to help you. Do you have a webpage as well? Just curious. What's your URL. I'll pop over and follow you.
I don't really know the answer, Beth. I like having mine because it's a steady presence. I update it when something major happens: a new book sale, an appearance schedule. Some like having them. Some just go with the blogs. I think it's a personal choice, but maybe some promotion guru will have a different idea. I'm just a writer who happens to dabble in promotion.
Hosting any new blogfests soon?