You can share any place of your my places collection with other users who have Earth Explorer installed on their phone!
Simply go to my places and tap on the email button. Now, an email will be created that contains two hyperlinks.
The first hyperlink is for sharing a place between two windows phone users.
The 2nd hyperlink simply will display the place in Google Maps in case the recepient of your email opens that mail from a Desktop mail client.
When you receive such a mail on your phone, simply tap on the first link. Earth Explorer will open, the place will be added to your my places collection and it will be shown on the screen.