On its call, Facebook (NASDAQ: FB) said it expects revenue growth rates will decline by high single-digit percentages from prior quarters in Q3 and Q4. The company sees operating margins toward mid-30s. Shares are down 17.4%.

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Facebook (FB) Falls to Session Low, Down 20% to $174July 26, 2018 2:42 PM Facebook (FB) PT Lowered to $200 at OppenheimerJuly 26, 2018 9:18 AM Facebook (FB) PT Lowered to $200 at Piper Jaffray on Q2 Report; 'GDPR, Promotion of Stories & FX Drive Miss, Guide Down'July 26, 2018 9:05 AM Facebook (FB) PT Lowered to $195 at Baird on Q2 Report; 'Shares are Moving to the Penalty Box'July 26, 2018 9:00 AM Facebook (FB) PT Lowered to $205 at Monness, Crespi, HardtJuly 26, 2018 7:55 AM Needham & Company Reiterates Buy on Facebook (FB) Following In-Line 2Q July 26, 2018 7:42 AM Facebook (FB) PT Lowered to $140 at Pivotal Research Following 2Q July 26, 2018 7:33 AM Facebook (FB) PT Lowered to $225 at RBC Capital; 'One of the Best Entry Points'July 26, 2018 7:30 AM Facebook (FB) PT Lowered to $202 at Stifel Following 2Q July 26, 2018 7:29 AM Susquehanna Remains Bullish on Facebook (FB) Following 2Q July 26, 2018 7:17 AM Facebook (FB) PT Lowered to $220 at Wells FargoJuly 26, 2018 7:12 AM Facebook (FB) PT Lowered to $225 at Credit Suisse Following 2Q July 26, 2018 7:04 AM Facebook (FB) PT Lowered to $190 at Macquarie Following 2Q Report July 26, 2018 6:59 AM Facebook (FB) Shares Plunge 16% Post-Market Following EarningsJuly 25, 2018 5:31 PM Form 8-K Facebook Inc For: Jul 25July 25, 2018 4:09 PM Facebook (FB) Tops Q2 EPS by 2c, Revenues Miss; Warns Revenue Growth to SlowJuly 25, 2018 4:07 PM Facebook Reports Second Quarter 2018 ResultsJuly 25, 2018 4:05 PM