The founder of social networking site Twitter has warned the site's users that spending hours a day interacting with the service is "unhealthy".

Speaking at a conference in Montreal, Biz Stone said it is not good that some individuals are claimed to be so obsessed with the platform they remain logged in for up to 12 hours a day.

Mr Stone said that while he wants visitors to return to the site frequently, some people may need to rethink the way in which they interact with the service.

He said: "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."

Discussing the service – which is now claimed to have processed over 500 million registrations, according to a report from Twopcharts – Mr Stone recounted how there had been serious doubts the concept would succeed at the start.

He also confirmed there are no plans to increase the limit of messages from its current 140 characters.

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