querying the graph api with curl

The easy way is to use graph API explorer, go there and get and acces token with your facebook developer account:

Generate a Basic User Access Token

When you get to building your own app, you'll need to learn about access tokens and how to generate them using Facebook Login, but for now, we can get one really quickly through the Graph API Explorer:

Click on the Get Token button in the top right of the Explorer.
Choose the option Get User Access Token.
In the following dialog don't check any boxes, just click the blue Get Access Token button.
You'll see a Facebook Login Dialog, click **OK" here to proceed.

You can use the graph api explorer as curl, but if you want to try it with a real curl the sintaxis is as follows for last api v2.8:

curl -i -H 'Authorization: Bearer YOUR_ACCES_TOKEN' -XGET 'https://graph.facebook.com/v2.8/me'

in my case:

toni@MBP-de-Antonio  ~  curl -i -H 'Authorization: Bearer MY-ACCES_TOKEN' -XGET 'https://graph.facebook.com/v2.8/me'
HTTP/1.1 200 OK
x-app-usage: {"call_count":2,"total_cputime":3,"total_time":3}
Expires: Sat, 01 Jan 2000 00:00:00 GMT
x-fb-trace-id: BnLv25AHTjq
facebook-api-version: v2.8
Content-Type: application/json; charset=UTF-8
x-fb-rev: 2929740
Cache-Control: private, no-cache, no-store, must-revalidate
Pragma: no-cache
ETag: "39875e94193dcd62dcbbf583fc0008c110820a6c"
Access-Control-Allow-Origin: *
X-FB-Debug: fvO9W8Bfl+BihEy/3aZyzOiMrXOkrbK8q1I3Xk2wYnI7sSujZNC6vQzR4RoTWK7K3Hx6EdzoE2kZ/aWhsXe4OA==
Date: Sat, 01 Apr 2017 06:55:52 GMT
Connection: keep-alive
Content-Length: 61

{"name":"Antonio Juan Querol Giner","id":"10204458008519686"}%