You can easily change this URL to just your name or to reflect your personal brand.
You is not to use online networking tools a lot. Your goal is to use online networking tools effectively.
Have you heard about the "fake"job postings some companies put on job boards? How can you tell if you're wasting your time?
Will Google+ take the throne from those two social networking giants? Only time will tell. Once thing is certain: Using Google+ will help your job search.