IAB: digital ad revenue rose to $59.6B in 2015, up 20% from previous year, driven by mobile ad spend, up 66% to $20.7B, and social media revenue, hitting $10.9B
George Slefo / Ad Age :
Context & Ripple Effects
The IAB's full-year 2015 tally confirms what its record first-half figure ($27.5B, mobile at 30% of spend) already signaled: growth is being carried by mobile and social rather than legacy display formats. Mobile alone grew 66% to $20.7B — roughly a third of all digital revenue — while social hit $10.9B.
The report matters because it sets the baseline for the following year, when digital ad revenue reached $72.5B and surpassed TV for the first time — a crossover that only looks inevitable against this 2015 trajectory.
First-order effects
- Mobile goes from side channel to core budget line in one year: at $20.7B it now accounts for about a third of the $59.6B total, forcing buyers who treated mobile as experimental to plan around it.
Second-order effects
- Publishers and networks without meaningful mobile or social inventory face pricing pressure as ad dollars concentrate where the growth is — the same concentration dynamic the IAB later pushed back on when disputing the Google/Facebook 'duopoly' framing in its 2016 report.
Third-order effects
- If the pattern holds, digital overtakes TV as the largest ad channel — which is exactly what the 2016 data showed — and measurement bodies like the IAB become the de facto scorekeepers of the shift, with their half-year and annual reports functioning as the industry's benchmark series.
The trend: Ad budgets are migrating from traditional media into mobile and social channels, with each IAB annual report marking another step in digital's climb toward overtaking television.