what industry is Facebook in and a short history?

what industry is Facebook in and a short history. A short history of the industry and its growth to-date.
A full external analysis of the important strategic factors affecting the
industry today. You will need to narrow these factors down to the 10 most important factors affecting change in the industry. These ultimately represent opportunities and threats for companies competing in this industry.

About the industry side, you need to separate it into two sections: one is internet information provider(revenue model), which compete with YAHOO, GOOGLE. 
another side would be social media, base on the customer base. 
the competitor: twitter,linkeln, snapchat etc.