iCloud 
View subscribers to shared streams
You can see who’s subscribed to shared streams you own or subscribe to.
On an iOS 7 device
In the Photos app, tap Shared at the bottom of the screen, then tap Streams at the top of the screen.
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Tap the shared stream whose subscriber list you want to see, then tap People.
The Activity stream doesn’t have subscribers.
On an iOS 6 device
In the Photos app, tap Photo Stream.
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Do one of the following:
On iPad, tap Edit, then tap the shared stream.
On iPhone or iPod touch, tap the arrow to the right of the shared stream’s name.
On a Mac using iPhoto or Aperture
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For instructions, see one of these iPhoto Help or Aperture Help topics:
On a Windows computer
Select iCloud Photos under Favorites in a folder window of File Explorer (Windows 8) or Windows Explorer (Windows 7).
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Double-click the shared stream whose subscribers you want to track, then click Info or Options in the toolbar.
The Info button appears in the toolbar for a stream you subscribe to.
The Options button appears in the toolbar for a stream you own.
The Activity stream doesn’t have subscribers.