if you ask, which one would they recommend for businesses to pay for (if they had to), Twitter beats Facebook by more than two to one (39.6 percent vs. 15.3 percent). LinkedIn again comes in second. Why did Twitter come out on top. It is seen as an efficient way for companies to get their marketing messages out there.
I find it interesting that twitter beats out linkedin in the survey. This tells me that twitter is used mostly by professionals at this point of time and has a better engagement rate than linkedin.