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I'm currently running OS X 10.11.1 and find this weird thing in Notification center. So what it stand's for and how to remove if it's not necessary?enter image description here

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This is part of the private CoreFollowup System Framework at

/System/Library/PrivateFrameworks/CoreFollowUp.framework/Versions/A/Support/followupd

There is no documentation about it, but the header files found at (that's for iOS, but I guess the framework is the same):

https://github.com/nst/iOS-Runtime-Headers/tree/master/PrivateFrameworks/CoreFollowUp.framework

don't show any evil things.

I suppose, it's for "following up" on notifications posted by other applications. There is an internal database of which the statements can be grabbed from the binary. It only contains title, body, some IDs and dates. Example:

INSERT INTO notifications (item_id, title, body, unlock_label, relevance_date, activate_action_id, dismiss_action_id, clear_action_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?)

So, no – you should and cannot remove it.

[EDIT]

Regarding the icon. Some examples of system applications having that icon: icons

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    Hm, why it has so weird icon and name, if it's all ok with it?! – k1r8r0wn Nov 6 '15 at 17:31
  • the icon is the standard icon for shell commands. every unix based system application has that. – k1th Nov 6 '15 at 18:30
  • I ask, because other icons are fine... – k1r8r0wn Nov 7 '15 at 10:21
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    that's because thats the only unix application that is listed there. I assume, Apple is going to hide that one in a future release so nobody gets nervous about it. – k1th Nov 7 '15 at 12:12
  • It'll be much better, I think – k1r8r0wn Nov 7 '15 at 12:31
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  1. Go to AirDrop in Finder.
  2. Set the setting to let 'no one' find you.
  3. Don't send any files from iOS or other devices using AirDrop.
  4. Restart Mac.
  5. Gone.

I tested this with an iMac, a Mac Mini, and a Macbook Air 13. All restarted without followupd appearing any more.

I can recommend PhotoSync app to use instead to transfer files wirelessly which avoids this problem, and works between Mac, Windows, iOS and Android devices, making it a perfect solution for wireless transfer between multiple operating systems.

I am convinced it is AirDrop since it allows iOS devices to transfer files to OS X, because of the fact that when I AirDrop a file from my iPad or iPhone to the Mac, a notification banner and sound pops out from the right side of screen. Also, in Notification Center settings in OS X El Capitan, there is no AirDrop present to deactivate banners and sounds, and as soon as I AirDrop a file to Mac, followupd appears in the notifications again, with all settings reactivated to banners and sounds. Hence, even if you deactivate all tick boxes in followupd, as soon as you AirDrop to Mac from another device, it is instantly reinstated.

AirDrop settings

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This looks like it's involved in the mechanics of notifications on a low level. My guess is that it has been there all along, but this time the developer forgot to hide it and it escaped testing.

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