Reconciliation to the most comparable GAAP measures are available in today's earnings press release, which is available on our investor relations website at ir.doubleverify.com. Advertiser growth was positive across all key industry verticals in the quarter as we continue to benefit from our focus on further diversification of customer engagements and ad spend across various client types. We also repurchased $100 million worth of shares year-to-date, reflecting confidence in our business and our commitment to returning capital to shareholders as a core element of our long-term value creation strategy. DV is the independent, essential trust layer that marketers rely on to ensure their ad spend is protected from fraud and unsuitable context, and most importantly, delivers the highest possible return on investment.
This essential role in the ecosystem continues to expand as new product innovations power our growth flywheel. Driven by continued success on Meta, social measurement grew 23% year-over-year, a significant acceleration from Q4. Social activation, our fastest-growing solution set, grew 92% year-over-year in Q1, up from 62% in the fourth quarter. Our midterm goal remains to increase the contribution of social, streaming TV, and AI-driven solutions from under 30% of total revenue today to approximately 50%.
We remain focused on creating a revenue mix that closely aligns with the fastest-growing global digital ad sectors. DV continues to drive new revenue opportunities, distance ourselves from competition, and create meaningful margin expansion through AI efficiencies and product innovation. Shifting focus to the role that AI is playing in the ongoing expansion of our product-led growth cycle, we continue to lean into AI to operate more efficiently, launch products faster, and improve margins. As the emerging AI advertising universe evolves, it is creating new revenue opportunities that expand our TAM as we extend our essential role in this burgeoning environment.