Self-marketing online (and where else is it nowadays?) is best done by delivering your message using as many platforms, tools and devices as possible. This also includes a "Presume" on Sliderocket.com and a personal Prezi presentation too. Then link them altogether.
How weird would it be if Coca Cola used only billboards for advertising and not TV, online and magazines? Same goes for us.
When someone puts your name in google search...not only Linkedin should come up but a whole plethora of branded links about you that you own and control: website, blogs, etc.
But, like everything else online, websites are now commodities and therefore cheap, if not free. You can build your own with little talent for design and no money and still have a passable result. I will be better than Linkedin because it is uniquely you. A personal website enables us to truly express our uniqueness compared to template-driven social sites. They all have different purposes. Linkedin and other social sites are first and foremost connectors rather than a branding instrument.
There are several cloud services for websites where the building and hosting is free as well is the maintenance. Try www.weebly.com . I build all my client's sites there...since 2009 almost 80. My own business and personal websites and blogs are on Weebly: www.pattiwilson.com, www.pattiwilson.net, www.santacruzcalifornia.us, www.joyousdancer.com,
I don't think it matters in a Google search which site is point as people (especially search consultants) are curious enough to look at everything. When I sign my name in an email, I list my title, company, Linkedin, SKYPE, website URLs, my phone number. People usually copy all of it for their Outlook files or whatever.
The web is moving towards image driven content and curated content. How better to provide both images and curated content of ourselves than a website? Although I do have my business on Pinterest too.
www.about.me is an online business card that will link and point to all other sites online where your profile and dossier exists. If you can only put one link under your name in an email, then use that site. It is free. The only competitor that I know of to about.me is www.flavors.com . You can do both. About.me is one page and they will provide you will a print business card that matches your about.me profile too.
Send me an email if you want to see a rainforest research science project website that a 9 year old built by herself using Weebly or some of the sites I have done. Patti@pattiwilson.com