All the questions listed under are related to Twitter.Inc and Facebook , please be specific

Identify the economic characteristics of the industry in which the firms participate and assess their level of competitiveness.

a.Economic attributes : demand, supply, manufacturing & marketing

b.Rivalry among Existing Firms (direct rivalry, diffuse rivalry, or concentrated rivalry (such as a monopoly, a duopoly, or an oligopoly)?

c.Threat of New Entrants.

How easily can new firms enter a market?

Are there entry barriers such as large capital investment, technological expertise, patents, or regulations that inhibit new entrants?

Do the existing rivals have distinct competitive advantages (such as brand names) that will make it difficult for other firms to enter and compete successfully?

Do the firms in the industry will likely generate higher profits than if new entrants can enter the market easily and compete away the excess profits?

d.Threat of Substitutes.

How easily can customers switch to substitute products or services? How likely are they to switch?

thanks for the help ~

provide refrences if u can