Which of the following statements about businesses' use of Facebook and other social networking sites is most accurate?
选项：

A:Social networking sites provide more obtrusive, less-tailored advertisements than traditional marketing campaigns.;
B:Media-savvy businesses can positively affect their customers' beliefs and counter negative perceptions on these sites.;
C:Business use of Facebook and similar sites has now grown to nearly 40 percent of global companies.;
D:Facebook and other sites offer plenty of social opportunities, but companies have been unable to identify practical business applications.