In a recent blog post, Microsoft gives some information on how Windows 8 app developers can use the Share charm in the US inside their apps to send info to other users.
Giveaway: Win the Logitech G910 Orion Spark mechanical keyboard!
Six Windows 10 features not available to Insiders... yet
All the latest on Windows 10 build 10041
windows 10 technical preview
Microsoft wants to turn Android phones into Windows 10 phones
LG Windows Phone mock-up
How to get Cortana working outside of the US in preview build 10041