If you have taken photos using Nexus 7's camera, it's easy to share, email or make them available to public. Within the Android Photo Gallery app, you can send the pictures from your Nexus 7 tablet.
* Touch "Gallery" app from Home screen.
* Gallery app contains all the photos and video. Browse to the folder that has pics to send, tap on the picture to open it.
* It will give you options: "Set as", "Share" and "Delete". Touch on the "Share" option and select what you need to use in the lists, including Bluetooth, Facebook, Gmail, Messaging, Picasa, Twitter and email.