bob peck has been manning the red phone and joins us with the word on facebook. bob, julia mentioned a host of reasons as to what could have contributed to the selling between slowing ad growth to a heavy spending year for 2017. why do you think the stock is down so much? >> the quarter itself was fantastic. users have grown, engagement has grown, monetization of users. and all of that on better incremental margins around 70% or so. and they einar row down the cost. so why is the stock down? really is about guidance. they talked about increased heavier investment. what's interesting here, this is somewhat big for the street. the street looking for 40% growth next year, '17 coming down from 50% and also expecting some margin degradation, looking for 300 bits of degradation. a lot of this is baked in. the real question will be about magnitude, how much is that investment which we don't know and also this is an investment versus, say, cost. and they talked about some of their investments, vr, video, et cetera. so the magnitude will be the important point. >> so sound