Spending hours on Twitter is unhealthy - Biz Stone

Biz Stone, Twitter's co-founder and creative director, said users should visit the site for information but leave once they had found it because spending hours on it is "unhealthy". He expressed it at a business conference in Montreal, Canada.

"I like the kind of engagement where you go to the website and you leave because you've found what you are looking for or you found something very interesting and you learned something," he told the Board of Trade of Metropolitan Montreal on Wednesday.

"I think that's a much healthier engagement. Obviously, we want you to come frequently."

The social networking guru, also said there were no plans to increase Twitter's 140-character limit, according to the Montreal Gazette.