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Create Facebook Developer Account

First, login to facebook;

Second, follow this link: https://developers.facebook.com/docs/apps/register

Then, in "Add a new app", click "basic setup"

To get the "Application ID" and "App Secret", click "Settings"/Basic

Access App Dashboard

Login to your facebook account, then access https://developers.facebook.com/apps

Login and ask for permissions

FB Permissions

https://developers.facebook.com/docs/facebook-login/permissions/

Login and ask for permissions with FB javascript SDK

<!DOCTYPE html>

<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
// This is called with the results from from FB.getLoginStatus().
function statusChangeCallback(response) {
console.log('statusChangeCallback');
console.log(response);
// The response object is returned with a status field that lets the
// app know the current login status of the person.
// Full docs on the response object can be found in the documentation
// for FB.getLoginStatus().
if (response.status === 'connected') {
// Logged into your app and Facebook.
testAPI();
} else if (response.status === 'not_authorized') {
// The person is logged into Facebook, but not your app.
document.getElementById('status').innerHTML = 'Please log ' +
'into this app.';
} else {
// The person is not logged into Facebook, so we're not sure if
// they are logged into this app or not.
document.getElementById('status').innerHTML = 'Please log ' +
'into Facebook.';
}
}

// This function is called when someone finishes with the Login
// Button. See the onlogin handler attached to it in the sample
// code below.
function checkLoginState() {
FB.getLoginStatus(function(response) {
statusChangeCallback(response);
});
}

window.fbAsyncInit = function() {
FB.init({
appId : '28332347239273',
cookie : true, // enable cookies to allow the server to access
// the session
xfbml : true, // parse social plugins on this page
version : 'v2.5' // use graph api version 2.5
});

// Now that we've initialized the JavaScript SDK, we call
// FB.getLoginStatus(). This function gets the state of the
// person visiting this page and can return one of three states to
// the callback you provide. They can be:
//
// 1. Logged into your app ('connected')
// 2. Logged into Facebook, but not your app ('not_authorized')
// 3. Not logged into Facebook and can't tell if they are logged into
// your app or not.
//
// These three cases are handled in the callback function.

FB.getLoginStatus(function(response) {
statusChangeCallback(response);
});

};

// Load the SDK asynchronously
(function(d, s, id) {
console.log ("load SDK entered");
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/sdk.js";
fjs.parentNode.insertBefore(js, fjs);
console.log ("load SDK completed");
}(document, 'script', 'facebook-jssdk'));

// Here we run a very simple test of the Graph API after login is
// successful. See statusChangeCallback() for when this call is made.
function testAPI() {
console.log('Welcome! Fetching your information.... ');
FB.api('/me', function(response) {
console.log('Successful login for: ' + response.name);
document.getElementById('status').innerHTML =
'Thanks for logging in, ' + JSON.stringify(response);//response.name + '!';
});
}

</script>

<script>
FB.login(function(response) {
if (response.status === 'connected') {
// Logged into your app and Facebook.
} else if (response.status === 'not_authorized') {
// The person is logged into Facebook, but not your app.
} else {
// The person is not logged into Facebook, so we're not sure if
// they are logged into this app or not.
}
});
$(document).ready(function(){
console.log("entering document ready");
// FB.init();
console.log("after FB.init");
});
</script>

</head>
<body>

<p id="demo"></p>
<fb:login-button scope="public_profile,email,user_friends,user_location" onlogin="checkLoginState();">
</fb:login-button>
<div id="status"><div>
</body>
</html>

Login and ask for permissions with URL redirect

<a href="https://www.facebook.com/dialog/oauth/?client_id=3984574353470&redirect_uri=http://www.myapp.com&state=YOUR_STATE_VALUE&scope=public_profile,publish_actions,email">LOGIN!</a>

This will be response from above request. You can verify the returned "state" and take the returned "code" to request access token. When requesting access token, you also need your app's client_id, client_secret, redirect_uri. 

http://www.myapp.com/?code=AQDtUViAQ4sTPGu3qSjvSuPcT__4NMEHHe4OeVdnDKVg2koZ7lrbnahsSSW-J483lklDlwDsnYLBHmxGvOB-vQlJ8n3aP-4uS8bnXLgbCFn1Ofg9LA2FoSz0036lf_iAftMGgsS7rBEdxOZTKhYibPse_lSiKXVMDi8Be5QXYdaAcN5xBlxaupBmLNU7fgtuyeq_uIx3Q7lzIBouJat3R_yy9SvVvAu8CqoEQcND8yws54OwHa5-Q64aPOFtTuLx95R1fi0kQgAaFkUusbyyIWsTNbXTYV1FDB5AL0kwOECqAcrJ1cPbkn2I2SWs3PFfmMAyKPjp29jIYSEWanYstyKT&state=mystatevalue123#_=_

How to post to group and page?

https://developers.facebook.com/docs/graph-api/reference/v2.6/post