Disclaimer:
These pages about different languages / apis / best practices were mostly jotted down quckily and rarely corrected afterwards.
The languages / apis / best practices may have changed over time (e.g. the facebook api being a prime example), so what was documented as a good way to do something at the time might be outdated when you read it (some pages here are over 15 years old).
Just as a reminder.

Developer notes on doing different facebook integrations (connect, opengraph etc)

Some notes on facebook development (e.g. connect, opengraph)

Links

Graph API
php-sdk

Facebook slow things down

On a project of mine I use Facebook connect. In the header of the page I display the avatar of the user from facebook. This caused the web page to be very slow at times when facebook was having problems. So what I did was to load the facebook avatar in parallel, below is the code snippets i use:

the html that should display the avatar:
<img src="icon.php">
icon.php:
/*
 * redirect to the facebook image for the logged in user
 */
try{
  require_once '/var/www.website.safe/include/util/error_handling.php';
  require_once '/facebookcode/include/config.php';

  session_start();

  require_once ('/facebookcode/include/login.php');
  require_once '/facebookcode/connect/websiteFacebook.php';

  if(! loginIsUserLoggedin()){
    $img = '/img/default.png';
  }else{
    if(isset($_SESSION['fb_iconurl'])){
      $img=$_SESSION['fb_iconurl'];
    }else{
      $img= websiteFacebookGetUserImage();
      if(isset($img)){
        $_SESSION['fb_iconurl']=$img;
      }
    }
  }

  header( "Location: $img" );
}catch(Exception $e){
  require_once '/facebookcode/include/util/logger.php';
  logger_LogMsg("problem in fbparallell: Exception=".$e);
  $img = '/img/default.png';
  header( "Location: $img" );
}

The websiteFacebookGetUserImage() does in essence this:
$old_rest_call_param = array('method' => 'users_getInfo', 'uids' => $facebook->getUser(), 'fields' => 'pic_square_with_logo');
$user_details=$facebook->api($old_rest_call_param); 
if(! empty($user_details)){
  return $user_details[0]['pic_square_with_logo'];
}else{
  return "";
}

Alternative to fbml login button

<a href="#" onclick="FB.Connect.requireSession(function (){window.myCallbackMethod();}); return false;" ><img
id="fb_login_image"
src="http://static.ak.fbcdn.net/images/fbconnect/login-buttons/connect_dark_large_short.gif"
alt="Connect"/></a>

Displaying friends with avatars

function facebookOpengraphGetUsers(){
    global $configFacebookApiKey;
    global $configFacebookSecret;

    require_once "/facebook/connect/facebook.php";
    $facebook = new Facebook($configFacebookApiKey, $configFacebookSecret);

    //get all friends that also uses this app
    $tmp = $facebook->api_client->friends_getAppUsers();

    $user_details = $facebook->api_client->users_getInfo($tmp, 'last_name, first_name, pic_square_with_logo');

    return $user_details;
}

More programming related pages

Workflow: Release process
Workflow: Bug tracking
Teambox (Redbooth) - Mantis connector
Design Patterns
Git & Github
Go / Golang
CVS
CVS backup script
Distribution process
Installation script
Java Server Faces
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PostgreSQL
Python / py2app
Shell scripts
Xslt
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Facebook / Opengraph
PHP developer notes
Redbooth API through php
Website optimization
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Javascript / html / css links