Twitter has been accused of interference in Irish politics after the managing director of the company's Irish operation claimed that a Yes vote would enhance Ireland's economy.
At a meeting today involving the Taoiseach and technology leaders, Twitter's Stephen McIntyre said a Yes vote would show that Ireland is inclusive, and a good place for international investment.
But Ben Conroy from Iona Institute - which opposes same-sex marriage - said the comments marked a precedent of overseas companies trying to influence Irish voters.