Authentication flow for a native phone app

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When I open up the the Youtube, Facebook, Instagram, or Twitter apps on my phone and I'm asked to login - what actually happens?



  1. Is OAuth used at that point? Or only after authenticating with the username/password/MFA?

  2. Which OAuth flow is used?

  3. I never see a permissions box since these apps are built by their respective companies, so how do they do that with OAuth?





authentication oauth oauth-2.0







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    up vote
    0
    down vote

    favorite












    When I open up the the Youtube, Facebook, Instagram, or Twitter apps on my phone and I'm asked to login - what actually happens?



    1. Is OAuth used at that point? Or only after authenticating with the username/password/MFA?

    2. Which OAuth flow is used?

    3. I never see a permissions box since these apps are built by their respective companies, so how do they do that with OAuth?





    authentication oauth oauth-2.0







    share|improve this question























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      When I open up the the Youtube, Facebook, Instagram, or Twitter apps on my phone and I'm asked to login - what actually happens?



      1. Is OAuth used at that point? Or only after authenticating with the username/password/MFA?

      2. Which OAuth flow is used?

      3. I never see a permissions box since these apps are built by their respective companies, so how do they do that with OAuth?





      authentication oauth oauth-2.0







      share|improve this question













      When I open up the the Youtube, Facebook, Instagram, or Twitter apps on my phone and I'm asked to login - what actually happens?



      1. Is OAuth used at that point? Or only after authenticating with the username/password/MFA?

      2. Which OAuth flow is used?

      3. I never see a permissions box since these apps are built by their respective companies, so how do they do that with OAuth?





      authentication oauth oauth-2.0




      authentication oauth oauth-2.0






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 10 at 1:43









      Konstantin

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