Which social media platforms seem geared towards personal use and which ones seem to work better for business.
I think that all social media has the potential to be useful for a business depending on the target demographic or type of business.
Facebook is a very social/personal media system but because is has such a strong following and is highly customize able, it makes a great marketing tool.
YouTube, Instagram and Pinterest seem more geared towards personal use, but have potential to be used for business marketing if the need fit.
Linked In and Yelp are very much geared toward business use.