What comparisons show similarities or differences between two or more items from different classes or categories?

To use Facebook effectively, public relations practitioners must always remember that

A) Facebook is only a simple blog, so creativity will be limited. B) the best approach is to dominate the page every day. C) they may have to "shut down" contributors at any time. D) establishing connections takes thought and creativity. E) Facebook will soon be eclipsed by the next major social media vehicle.

According to a 2006 study, the most popular quantitative research technique in public relations was:

a. Content analysis b. Experiments c. Ethnography research d. Survey research