In case you want to share something from iOS7, look for this symbol
Or you want to share a location...
The sharing symbol appears on the bottom of the screen.
You'll be able to choose between sharing a selected or your current location.
Again, you'll be presented with your sharing options
You'll notice "AirDrop" amongst these options - it can send whatever you want to share to a device nearby (for example another iPhone or iPad running iOS7 or your Mac)
Or you want to share a photo...
Select a photo
The symbol is on the lower left
Then you'll be presented with your sharing options
And it's on the bottom of any page in Safari as well.
Again you'll be presented with the sharing options
FYI: iOS7 is currently available as a Beta version to developers, for everyone else it will be available later this year. You'll find more info on the Apple website.