A recent Harris poll reveals some interesting opinions on Twitter (access here in PDF) - most notably that just 8% of advertisers say Twitter is "very effective" for promoting products and ideas.

Just under half of advertisers (45%) say that Twitter is something in its infancy and its use will grow exponentially over the next few years, while one in five (21%) believe Twitter will not move into the mainstream and is something mostly young people and the media will use. Just under one in five advertisers (17%) believe Twitter is already over and it’s time to find the next best thing while 17% of advertisers say they don’t know enough about Twitter to have an opinion on it.

Among consumers it is a different story altogether, as over two-thirds (69%) say they do not know enough about Twitter to have an opinion about it. Just over one in ten say it is just at its infancy (12%), 12% also say it is just something that young people and the media will use and 8% of consumers say it is already over and it’s time to find the next best thing.

What's most notable however is that just 8% of advertisers say Twitter is "very effective" for promoting products and ideas - that's not good. While half (50%) say it is "somewhat effective, 34% of advertisers say it is not that effective and 8% believe it is not at all effective for promoting products and ideas.

Can it get any worse for TWitter? Not much in my opinion.
Wait - did you hear that? Wasn't that the fail whale jumping over the shark?