How did social media begin, and how has it found so much favor in such a short period of time?

Compare and contrast Facebook, Twitter, LinkedIn, and YouTube, describing each in your own words. Describe and provide an example of each.

How is a social media chosen and integrated into a marketing plan. How is the effectiveness of the use of social media measured?

How is a social media chosen and integrated into a marketing plan. How is the effectiveness of the use of social media measured?