After launching Sticker Previews, negative user sentiment about sending the wrong sticker decreased, while positive user sentiment about ease-of-use increased. This is one of several examples of products we launched to increase MAUs. Through testing and observing metrics, we can improve the user experience and grow MAUs in a timely manner.
As a result of our experiments, MAUs grew 6% from Q3 to Q4 2014, and 13% from Q4 to Q1 2015. In total, we won about 35 million MAUs in half a year.