You have to log on to facebook (with any valid account), go to Account - Application settings - Developer - Set up new application (button at the top right). After creating application you will see the key and secret at application settings page. In my Facebook account, where can I find these application IDs, secret key, all? Grant access from a Facebook account that has access to manage the target page. Note that if this user loses access the final, never-expiring access token will likely stop working. After hours of trying I've finally found a solution. Delete any app on the website of Facebook (developers.facebook.com) Delete the file debug.keystore under C:\Users\yourUserName\.android Generate a new key (by running your app again) Create a new app on developers.facebook.com and add the new hash key Re-run your app Succes! Unsupported GET/POST request almost always means that you are either using a wrong id (remember, user ids are app-scoped!), or do not have the necessary permissions. Is there any way to add a Facebook Share Button to a static HTML page? I've implemented a simple web site with no server side, just a bunch of html pages and I was abble to add a Like button because it is implemented with iFrame element. I have searched for a solution regarding the Share Button before posting here, but can't really find anything. It's a page, hence the /pages/ portion of the URL. There is technically an event setup on facebook, but the above URL is the location in which updates will be posted. I would like to just show these updates from this page, as opposed to having to retype them on my website. This will make the Facebook Page Plugin responsive, but only on the initial page render, with a minimum width of 180px. I'm still trying to figure out how to make it truly dynamically responsive, in spite of Facebook's caveat (I'll post an update if I ever find the answer). Using Facebook API v3.1 - None of the answers above worked for me. Instead, I had to: 1) Create a system user 2) Grant him access to the properties I needed (in my case an App) 3) Generate a new token for that app and system user The instructions I used can be found here I've been having a similar issue with facebook for a few times now appearing out of the blue. Facebook doesn't really give any information about what's actually causing the issue which leaves me without any clue on what to do every time. Update July 16th 2023 It happened to me again. The original answer below didn't fix it for good.