Ompetative Analysis of Social Networking Industry

Please write one page marketing comparision/business level strategy analysis for the following 5 social networking competitors:
-Facebook;
-Twitter;
-LinkedIn;
-MySpace;
-Pinterest.
Discuss each of the following:
1)Product Characteristics: Key products of each. How do competitors diferentiate?
2)Pricing Characteristics: Competative strategy differences.
3)Promotional Characteristics: Differences in advertising and promotional strategies.
4)Competative Rivalry: Degree of rivalry in each segment. Price wars? Frequent product innovation?