Thanks, Jeremi. Our Q1, 2019, financial results reflect our continued focus on driving growth, revenue, and long-term operational efficiencies. Our Q1, 2019, operating cash flow improved $166 million to negative $66 million compared with Q1, 2018, and improved $60 million compared with Q4, 2018. The year-over-year change in operating cash flow is driven by a $94 million improvement in adjusted EBITDA, offset by changes in the timing of working capital. Similarly, the sequential change in operating cash flow is driven by changes in the timing of working capital, reflecting the seasonality of our business between Q4 and Q1, partially offset by a $73 million decline in adjusted EBITDA. Our capital expenditures, which are nominal, are mainly associated with the build out of our office facilities. Q1, 2019, capital expenditures were $12 million, compared to $36 million in Q1, 2018, and $23 million in the prior quarter. Our Q1, 2019, free cash flow improved $190 million to negative $78 million compared with Q1, 2018, and improved $71 million compared with Q4, 2018. Common shares outstanding plus shares underlying stock-based awards outstanding, totaled 1,544 million on March 31, 2019, compared with 1,457 million a year ago. We ended the quarter with $1.2 billion of cash and marketable securities. Our change in cash for the quarter was negative $70 million. The change in cash was $151 million better than the prior year and improved $65 million versus the prior quarter, as we continue to make progress towards generating free cash flow. For the quarter, we generated record Q1 revenue of $320 million, an increase of 39% year-over-year, and a decrease of 18% sequentially, reflecting the expected seasonality in our business from Q4 to Q1. Daily active users were 190 million in Q1, 2019, compared to 191 million in Q1, 2018, and 186 million in Q4, 2018. Our results in Q1 benefitted from positive momentum at the beginning of the quarter, due to seasonality that we observed as a result of the holiday season. Average revenue per user was $1.68, an increase of 39% year-over-year and a decrease of 19% sequentially, again reflecting seasonality in our business. In Q1, 2019, North America ARPU increased 34% year-over-year, compared to a 23% year-over year increase in Q4 2018 and a 16% year-over-year increase in Q1 2018. In terms of our advertising business total impressions were up 155% year-over-year and 6% sequentially, while pricing was down 42% year-over-year and was down 22% sequentially. The price decrease was driven primarily by an increase in available supply. Infrastructure costs per daily active user were $0.72 in Q1 2019 down from $0.73 in Q1 2018 and flat sequentially. We have maintained our focus on unit cost efficiencies while growing daily active users by four million quarter-over-quarter. Our cloud infrastructure costs moving forward are expected to be driven by three primary factors. The first is the size of our community and the depth of engagement per user of our application. As engagement trends continue in a positive direction, we expect to observe higher infrastructure costs despite improving unit costs for the underlying cloud services and user actions. The second factor is the cost structure of our cloud partners where we continue to benefit from their growing economies of scale which are passed on to us in the form of lower rates. The third factor is how efficiently we utilize our cloud infrastructure. On this last front, we are seeing continuous improvements in the unit cost of delivering various services to our users including for example the cost to serve an advertising impression and the cost to deliver a Snap. In addition to infrastructure costs the remainder of cost of revenue is primarily made up of content costs and payments to third-party ad sellers which declined 11% sequentially and increased 10% year-over-year, primarily due to seasonality in our business. Gross margin expanded substantially year-over-year which continues to demonstrate that our business model is scaling profitably. Gross margin was 39%, improving over 2,100 basis points year-over-year. Although gross margin declined by 900 basis points sequentially, again, reflecting the seasonal nature of our business. Operating expenses in the quarter were $248 million, down 4% year-over-year and up 4% sequentially. We continue to focus on driving operating cost productivity across our business. Our operating expenses are primarily driven by employee-related costs, which represent about two-thirds of our operating expenses. We continue to see fixed cost leverage in employee-related costs which declined 2% year-over-year and were up 4% sequentially. Operating expenses as a percentage of revenue were 77% compared with 112% in Q1 2018 and 61% in Q4 2018. Q1 2019 adjusted EBITDA was negative $123 million, an improvement of $94 million over the prior year and a decline of $73 million over the prior quarter. This was the fourth consecutive quarter that we had an improvement in year-over-year adjusted EBITDA. Adjusted EBITDA margin for Q1 2019 improved significantly year-over-year to negative 39% compared with negative 94% in Q1 2018. Adjusted EBITDA leverage was 105% in the quarter compared to 104% in the prior quarter. Finally, Q1 operating loss improved $76 million over the prior year to negative $316 million. Our Q1 operating loss increased $121 million over the prior quarter. With respect to the second quarter of 2019, the positive trends we are observing in per user engagement may increase our infrastructure costs overall. Additionally, as Evan mentioned earlier, we plan to make additional investments in marketing, content, engineering, and sales to support our long-term strategic objectives and to build on the momentum we see in our business today. We believe that these investments will create value over the long-term, but in the immediate term, they will put downward pressure on the very high operating leverage we have observed in recent quarters. These forward-looking statements reflect our expectations as of April 23rd, 2019 and are subject to substantial uncertainty. As mentioned at the start of the call, our results are inherently unpredictable and may be materially affected by many factors. Now, I'll share our Q2 2019 outlook. Revenue is expected to be between $335 million and $360 million or to grow between 28% and 37% year-over-year compared to $262 million in Q2 2018. Adjusted EBITDA is expected to be between negative $150 million and negative $125 million compared to negative $169 million in Q2 2018. This guidance assumes among other things that no business acquisitions, investments, restructurings, or legal settlements are concluded in the quarter. While we are not going to give specific guidance on daily active users, we have previously seen stronger daily active user growth rates in Q1 when compared to Q2. With that, let's open up the line for questions.