The company has just agreed a deal to run the "No to AV" voting referendum web campaign, using social media to target key opinion-formers.
Look at the defeated alternative vote referendum in 2011.
Cameron urges his party not to "waste time trying to wreck the [alternative vote referendum] bill".
But unlike Cardiff west, the Alternative Vote referendum was also a key factor in drawing out the electorate today.
He said he did not expect politicians to play a major role in the alternative vote referendum.
The chance of next year's alternative vote referendum being held on a different day from key elections increased this evening.
Most had an opinion on the alternative vote referendum, with few believing that it would have any real impact on the turnout at the local election.
People I speak to here fully respect the choice your people have clearly made with the one-person-one-vote referendum.
Some of the key moments detailed are the coalition negotiations with the Lib Dems and subsequent row over the Alternative Vote referendum, the disastrous NHS reshuffle, and the loss of key staff in Andy Coulson and Steve Hilton.
Any major changes would require another treaty, which would mean some difficult parliamentary votes or referendums.
Voters have been summoned to vote in referendums seven times since 1990.
