Solo Practice University emphatically says no, notwithstanding the proliferation of other platforms such as Twitter, Facebook, LinkedIn, etc.
When you are blogging, the goal isn't to necessarily to come up with the freshest idea. Nor is it necessarily to scour the web and comment on the latest news first (unless you are a reporter.) If that is your goal you will most likely fail as others make a living being the 'first'. Your job is to practice law.
What you need to do on your blog is explore ideas, new or old, and then offer your perspective. This is what will distinguish your blog from others. If readers or potential clients can identify with your perspective, are intrigued by your voice on a given subject, they will prefer you as a resource over the next "voice" out there. Your tone, credibility, consistency and ultimately your reliability post after post, will bring you ... opportunities of all kinds.
All good points.