"As a result of increased efforts to ensure fair elections worldwide, we have made a decision to suspend all advertisements related to the referendum on the Eighth amendment to the Irish Constitution", - said in a statement.
He said a number of No groups had earmarked significant spending on the platform ahead of the referendum on 25 May to reach voters, and that it was a legitimate means of doing so.
They continued: 'What we are now doing for the referendum on the eighth amendment will allow us to operate as though these tools, which are not yet fully available, were in place today with respect to foreign referendum-related advertising'.
Google will begin enforcing the measure, which will apply to all its platforms including the phenomenally popular YouTube video channel, on Thursday and continue until the May 25 ballot, according to the spokesman. However Google is going further and pausing all ads targeting the vote.
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Ireland bars political donations from overseas, but the law does not apply to social media advertising.
Separately, the role of political advertising on social media has come under intense scrutiny since Channel 4 News, the Observer and others revealed how a British data firm was behind a "data grab" of more than 50 million Facebook profiles.
But at a press conference called by the pro-life campaign Save the 8th and the Iona Institute, campaigners claimed that the decision to ban ads on Google had been taken "because one side in this referendum is terrified of losing and wants to prevent voters from being informed".
Mr Lawless has been pushing for a law requiring all online advertisers to disclose the publishers and sponsors behind ads. Domestic campaigners and groups located in Ireland are still permitted to advertise about the campaign on Facebook at the time of writing.