Just under €80,000 was spent advertising on Google during the 8th amendment referendum campaign.
Figures released to Green Party leader, Eamon Ryan, show the ads led to over 15 million impressions.
Google banned all ads relating to the abortion referendum two weeks before polling day in May.
A government report earlier this year recommended regulating online political ads.
Political parties and other stakeholders are discussing the need to regulate online political advertising at an Open Policy Forum today.
A key plank of today's debates is a the Online Advertising and Social Media Transparency Bill, drafted by Kildare North Fianna Fáil TD, James Lawless.
Communications Minister Richard Bruton: