Twitter's Q2 ad revenue fell 8% Y-o-Y; Ad engagements rose 95% Y-o-Y

"In Q2, product contributions to Twitter’s engagement and audience growth continued to increase. Monthly active usage (MAU) increased 5% year-over-year [to 328m] and daily active usage (DAU) increased 12% yearover-year, marking the third consecutive quarter of double-digit growth.
• Underlying business fundamentals also improved. We saw an improvement in the year-over-year growth rate for total revenue (relative to Q1), driven by accelerating year-over-year growth in our data products, continued strong growth in video with a very strong debut at the 2017 Digital Content NewFronts, and an improvement in the yearover-year growth rate for owned-and-operated (O&O) revenue.
• Finally, we achieved greater operating efficiency. Our GAAP net loss was $116 million. Excluding a $55 million cost-method investment impairment charge, we would have made progress toward GAAP profitability and further reduced our GAAP net loss. We also delivered better-than-expected adjusted EBITDA margins in Q2, despite the yearover-year decline in revenue.
Specifically, in Q2, we achieved the following results:
• Q2 revenue totaled $574 million, a decrease of 5% year-over-year.
• Advertising revenue totaled $489 million, a decrease of 8% year-over-year.
• Data licensing and other revenue totaled $85 million, an increase of 26% year-over-year.
• US revenue totaled $335 million, a decrease of 7% year-over-year.
• International revenue totaled $239 million, a decrease of 1% year-over-year.
• Total ad engagements increased 95% year-over-year.
• Cost per engagement (CPE) decreased 53% year-over-year."
Source:  Twitter's Q2 Letter to Shareholders, 27th July 2017