I have a blog on blogspot that I use daily. I also have other blogs I use infrequently such as livejournal, xanga, yahoo 360 (two of those), wordpress, and many others that I don't use that much. I go by poetsespresso or dramaartwriting. I used to use a diaryland one under Maliger but decided to discontinue it.
How do you use them?
I use them to post poetry mostly. I usually use forums for any other subject.
How frequently?
Daily on blogspot, on the others whenever I feel I have something extra to say there and to touch bases.
What can one do to improve how useful or enjoyable they are?
I could get organized and research and do posts on web design and graphics to both benefit myself and give input or else to bring in visitors to my site and potential customers. I could rotate the ones I post in, doing one blog one day and a different blog another day, but I write so much that I perhaps would end up writing daily in all that I post to. I could also research writing topics and workshop exercises for creative writing, poetry, and/or publishing since I have experience in these.
Should one separate use of personal and business blogs?
I should but I haven't put the energy into that separation, perhaps because the business I do is so closely linked to doing things that I enjoy. And because I tend to be open, honest, expressive, and share things in a trusting fashion.