Does anybody knows how to delete some photos from the photosream?

you can't... if you want to delete them you have to turn photo stream off...apple should have thought this one out a bit better....

Originally Posted by andreaschar90

Does anybody knows how to delete some photos from the photosream?

You can only delete all the photos in photo stream. To do this you need to go to iCloud on your computer, you should see your app icons Mail, Contacts etc click on your name top right and you should get an account window, click Advanced then click Reset photo stream. This will clear the entire photo stream

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