Social media geared for business? Or Pleasure?

I think some of the more personal social media platforms would include the photo sharing sites like Instagram, personal life sharing sites Like Facebook/Myspace and entertainment sites like Reddit for example. A lot of these sites and others like them can be fun for personal use and at the same time allow businesses to gather data for market services and maybe sell you something as well. Which I think makes them great tools for businesses as well. I think today what we are seeing is businesses effectively blurring that line for more effective marketing and a better user experience.