I've written a few speeches that went across very well, and with those I didn't simply follow a person's speaking habits. I wrote in what is actually a very structured and thought out fashion. It's just not 5 paragraph format because it's not an essay for my teacher to grade.
Perhaps a better point would be 'To become a better BLOGGER you have to stop writing and start speaking.' Blogging is inherently informal, much like how I'm writing this comment now.