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PALO ALTO, Calif.--Facebook's chief operating officer, Sheryl Sandberg, says the company's still not sure why the recent redesign process irked so many of the Web site's users. city center las vegas


Facebook COO Sheryl Sandberg

(Credit: Corinne Schulze/CNET)"In terms of what went wrong with the redesign, we don't know yet," Sandberg said during a Q&A session at the Global Technology Symposium held Thursday at Stanford. But she added that the percentage of users giving the redesign a thumbs down was smaller than previous changes to the site.

"As a percentage of our users, this one is much less than before," she said.

She also offered a backhanded compliment to Twitter, the microblogging site that Facebook considered buying last year.

"What's interesting about Twitter is that they are a very good company doing one thing very well, which is real-time update," she said. "We are, by far, the largest photo-sharing site on the Web...Similarly, we are larger at doing what Twitter does. We think what they're doing is good. Our redesign is not in reference to them--nor was our redesign in reference to Flickr."city center las vegas

Separately, Sandberg said that the economy has not reduced advertising revenue. "We are growing our revenue. We are growing our advertising," she said, without getting into the specifics.