With iCloud Photo Sharing, you can share photos and videos with just the people you choose, and you can let them add their own photos, videos, and comments. read more
"Shared Photo Stream" is a feature Apple introduced after My Photo Stream. Instead of uploading every single photo taken, you can choose which photos to share to these private photo streams. This allows you to cherry pick the best photos and choose which friends and family can view those photos. read more
To upload photos to My Photo Stream on your PC, follow these steps: Click the Windows Start button, then click Pictures. Select iCloud Photos under the Favorites menu in the panel on the left. Click Upload photos. Select the photos you want to add to My Photo Stream, then click Open. read more