For every marketing exec that suggests using Twitter during a brainstorm session, there must be a few others who wonder “what’s the point”—or even more importantly—“what’s my ROI going to be?”

Turns out that only 8 percent of advertisers actually think of Twitter as a “very effective” promotional tool, according to eMarketer (piggybacking on some data from LinkedIn and Harris Interactive). Even more telling, is that just 8 percent of consumers think the same thing. (Click the chart to enlarge).