Sky News says Alwaleed is believed to have spoken with at least one of the cofounders about buying part of their stake.

FORBES: Saudi Billionaire Alwaleed Reportedly Interested In Twitter Stake

That, in summary, is the reaction inside Downing Street to how the media, including me, have spoken about today's joint news conference to be held at Downing Street by David Cameron and Nick Clegg.

BBC: Coalition: Official - it's not a marriage