I have an email address and want to find out if there is a Facebook user linked to this address. If there is, then I want to retrieve the url to this users profile page and save it somewhere. I do. This site is intended for bugs, features, and discussion of Stack Overflow and the software that powers it. You must have an account on Stack Overflow to participate. I'm sharing content from a website and every time I paste the link into Facebook it says 'page not found'. Sometimes it works when I manually add the 'www.' in front of the URL in the address bar. Facebook will not allow developers pre-fill messages. Developers may customize the story by providing OG meta tags, but it's up to the user to fill the message. This is only possible if you are posting on the user's behalf, which requires the user authorizing your application with the publish_actions permission. AND even then: Important notice: If you register for testing, go to your profile settings and to your interests add delete profile. Trying to login with Facebook to my website: I get the following error: URL 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). Stack Overflow | The World’s Largest Online Community for Developers from my Android app, I would like to open a link to a Facebook profile in the official Facebook app (if the app is installed, of course). For iPhone, there exists the fb:// URL scheme, but trying the Create an account or log into Facebook. Connect with friends, family and other people you know. Share photos and videos, send messages and get updates. Q&A for Humans discussing Stack Overflow for Agents.