Hope you guys find it useful and also do let me know your views on the same

One is cost. Large companies pay more (in some cases a lot more) for Internet access. Typically, users are BY DESIGN throttled down to about 100kb/sec. This is meant to give higher priority to business data transfers and transactions over their connections while keeping costs down. They don’t want to pay for you to Facebook… not even if it’s pennies extra per employee.

Another is security. Large corporations have many more servers and access points (i.e. vulnerabilities) than smaller ones. One virus gets in, and it’s not thousands of dollars, it could mean millions.

Finally, there’s the corporate culture. Small and medium size organizations are about growing. Social media is so important to help further that goal. Large companies are much like government… they already have a staff of dedicated people who do nothing else but work those mediums. They may have a marketing team, on a seperate cable modem outside their network, doing this work unfettered. But again, the above points don’t really apply. The main users will never see Facebook or Twitter in most of these firms. And their cultures typically frown on things that don’t make the company money (because they are so big, it’s like government… people can easy slack off).

Just my 2 cents having worked at all different sized companies. Your points are dead-on for small and medium size businesses, but have almost no meaning in large companies and government entities.