Twitter co-founder Biz Stone has re-iterated the wish to keep hold of the micro-blogging site, rather than sell out wholesale, but has said an initial public offering could be on the cards for the future.

"We are definitely not interested...

Twitter has begun the rollout of commercial accounts in earnest, and Founder Biz Stone has promised in an interview with VentureBeat that they'll be arriving "this year".

There'll be some premium features that businesses will get, in exchange...