Google has come up with a new sharing app, Spaces, for what it describes as small group sharing.
I'm not quite sure why this was done as there are plenty of alternatives already out there.
We wanted to build a better group sharing experience, so we made a new app called Spaces that lets people get people together instantly to share around any topic.
New Google Spaces, Small Group Sharing App for Android and iOS [googleblog.blogspot.com]
Added, I just installed it to check it out and it wants to use a Google account.
If Google had nade it without the Google account it might have greater takeup.
Who knows, it may go well from the get go.