Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Android Social Networking Free.
Android Social Networking v2.21
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Let word of mouth sell your game for you with this plugin! Post high score updates and achievements to the biggest social networking sites out there with just a couple lines of code. Features include Facebook dialogs for wall posting (with loads of options) and dead simple image uploads. It’s all here. For those who want to dig deeper into the Graph API with it’s wealth of information, we support that too. Twitter integration includes all the usual suspects including posting updates, images, getting a users followers and full access to the entire Twitter API! Facebook now support Single Sign On authentication!