Q: Can I share photostream with someone who does not use Apple devices?

Yes

See http://www.apple.com/icloud/setup/ for instructions on setting up iCloud (and PS) on a PC

There also is a web site with the photos that can be made publie and anyone with a web browser can access them there

LN

You can share "Shared Photo Streams" as a public website. Then everybody can view them, even without owning an Apple device. Shared PhotoStreams require a Mac using OS X Mountain Lion v10.8.2 with Photo 9.4 or later or Aperture 3.4 or later:

iCloud: Using and troubleshooting Shared Photo Streams: http://support.apple.com/kb/TS4379

To create a Shared Photo Stream in iPhoto,

see: Shared photo stream in iPhoto 9.4: http://help.apple.com/iphoto/mac/9.4/#phtf7fe6394

Regards

Léonie

Shared photoStreams are also available on a PC

How do friends and family view my photos?

Friends and family with iCloud accounts can view your photos in the Photos app on any device using iOS 6 or later; on a Mac in iPhoto 9.4 or Aperture 3.4 or later; on a Windows PC with Windows Vista or later and iCloud Control Panel 2.0 or later installed; or on a second generation or later Apple TV with software version 5.1 or later installed. They can also view your photos on the web if you enable Public Website in the settings or options for your Shared Photo Stream. Learn more about inviting people to view your shared photo streams.

Set up instructions for the PC are in my previous link

LN