Gourmet food trucks, popular in many American cities, are using Twitter to share location and create hipster buzz. Starbucks uses Twitter to run contests and spread free samples of new products. These examples demonstrate the use of Twitter as a$($n$)$:

a$.$

legitimate business tool.

b$.$

means for soliciting customer complaints and representations.

c$.$

source of breaking news on current events and warning mechanisms.

d$.$

support mechanism for activism, pushing for social change.

e$.$

effective tool for quickly blasting queries seeking insights and solutions to problems.