A new Reuters/Ipsos poll has some bad news for Facebook, as if it needed more following its initial public offering of stock troubles. The poll says four out of five Facebook users never bought anything due to Facebook ads or comments.

And, the poll says, more than a third of those surveyed, 34 percent, spend less time on the site than they did six months ago.

I wonder if that could be due in part to users going to other social networks such as Pinterest and Google+? There’s only so much time in a day and the social network scene is ever more fragmented.

That IPO trouble soured some toward the social network. About 44 percent of the 1,032 Americans in late May and early June said the IPO troubles made them less favorable to Facebook.

An eMarketer analyst said the poll results show “Facebook has work to do in terms of making its advertising more effective.”

Personally, we think it has more work to do than that. For one thing, the Timeline feature seems like a nearly total waste of effort on the company’s part. Why doesn’t it try to figure out what its users want instead of just forcing changes upon them? – Allan Maurer

See the full Reuter’s poll story for more details.

For my take on Facebook (and other online social networks) forcing their will upon us willy-nilly see: I don’t need no stinking Timeline.