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This question already has an answer here:

I've read this: What can an app do with the "USE ACCOUNTS ON THE DEVICE" permission??

In the main answer (by Dan) it's said:

The AccountManager then asks you if you want the requesting app (YouTube) to be able to use the requested account (Google account). This might be in a dialog that appears over the app, or in a notification.

However, upon installing something, e.g. Facebook (which adds facebook account as I understand) and starting to use it, I don't remember some system message asking me to grant access to facebook account to facebook app. Facebook app can post on facebook w/out using facebook account?

marked as duplicate by Izzy Jul 23 '16 at 12:43

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    Facebook app provides and owns that account I'd say :) So please also check the counter-part of the question you've linked: What does permission “MANAGE_ACCOUNTS” mean? – Izzy Jul 23 '16 at 12:20
  • @ Izzy, thank you. I've read post I mentioned more closely and see answer. should i better delete my question? Also, maybe you know answer to mine other one: android.stackexchange.com/questions/151803/… ? – Alexei Martianov Jul 23 '16 at 12:24
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    If the answer is already given there, this question here should either be deleted or closed as duplicate. Maybe the latter would be the better idea, with you providing a comment here clearly pointing to that answer. As for your other question: No specific insights on how operations with that token work – but using it elsewhere would first need that app to reveal the token, right? // PS: Did you check with our permissions tag-wiki already? Lots of useful information linked from there :) – Izzy Jul 23 '16 at 12:28
  • @Izzy, thank you. how do I mark it as duplicate? Also, maybe you can help w/out me creating other question - I have skype on two phones. on 5.1 I see skype account in settings, however on 4.4 there is no skype account (see viber, whatsapp etc.). Why could it be? – Alexei Martianov Jul 23 '16 at 12:37
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    Different question, and I cannot answer that. Please post it separately. – Izzy Jul 23 '16 at 12:43

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