To install: set up your root composer.json in your project like this
{
"name": "your-vendor-name/module-or-project-name",
"description": "A short one line description of your module or project",
"require": {
"oggetto/facebook-extension": "2.*"
},
"repositories": [
{
"type": "composer",
"url": "http://packages.firegento.com"
}
],
"extra":{
"magento-root-dir": "./"
}
}Other information about installation you can find at Magento Composer Installer