diff --git a/3rdparty/o2/src/o2facebook.cpp b/3rdparty/o2/src/o2facebook.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..43ca0754fcae775cc74ba0faeefffae2e4c53abe
--- /dev/null
+++ b/3rdparty/o2/src/o2facebook.cpp
@@ -0,0 +1,92 @@
+#include <QDebug>
+#include <QMap>
+#include <QString>
+#include <QStringList>
+#if QT_VERSION >= 0x050000
+#include <QUrlQuery>
+#endif
+
+#include "o2facebook.h"
+#include "o2globals.h"
+
+static const char *FbEndpoint = "https://graph.facebook.com/oauth/authorize?display=touch";
+static const char *FbTokenUrl = "https://graph.facebook.com/oauth/access_token";
+static const quint16 FbLocalPort = 1965;
+
+const char FB_EXPIRES_KEY[] = "expires";
+
+O2Facebook::O2Facebook(QObject *parent): O2(parent) {
+    setRequestUrl(FbEndpoint);
+    setTokenUrl(FbTokenUrl);
+    setLocalPort(FbLocalPort);
+}
+
+void O2Facebook::onVerificationReceived(const QMap<QString, QString> response) {
+    emit closeBrowser();
+    if (response.contains("error")) {
+        qWarning() << "O2Facebook::onVerificationReceived: Verification failed";
+        foreach (QString key, response.keys()) {
+            qWarning() << "O2Facebook::onVerificationReceived:" << key << response.value(key);
+        }
+        emit linkingFailed();
+        return;
+    }
+
+    // Save access code
+    setCode(response.value(O2_OAUTH2_CODE));
+
+    // Exchange access code for access/refresh tokens
+    QUrl url(tokenUrl_);
+#if QT_VERSION < 0x050000
+    url.addQueryItem(O2_OAUTH2_CLIENT_ID, clientId_);
+    url.addQueryItem(O2_OAUTH2_CLIENT_SECRET, clientSecret_);
+    url.addQueryItem(O2_OAUTH2_SCOPE, scope_);
+    url.addQueryItem(O2_OAUTH2_CODE, code());
+    url.addQueryItem(O2_OAUTH2_REDIRECT_URI, redirectUri_);
+#else
+    QUrlQuery query(url);
+    query.addQueryItem(O2_OAUTH2_CLIENT_ID, clientId_);
+    query.addQueryItem(O2_OAUTH2_CLIENT_SECRET, clientSecret_);
+    query.addQueryItem(O2_OAUTH2_SCOPE, scope_);
+    query.addQueryItem(O2_OAUTH2_CODE, code());
+    query.addQueryItem(O2_OAUTH2_REDIRECT_URI, redirectUri_);
+    url.setQuery(query);
+#endif
+
+    QNetworkRequest tokenRequest(url);
+    QNetworkReply *tokenReply = manager_->get(tokenRequest);
+    timedReplies_.add(tokenReply);
+    connect(tokenReply, SIGNAL(finished()), this, SLOT(onTokenReplyFinished()), Qt::QueuedConnection);
+    connect(tokenReply, SIGNAL(error(QNetworkReply::NetworkError)), this, SLOT(onTokenReplyError(QNetworkReply::NetworkError)), Qt::QueuedConnection);
+}
+
+void O2Facebook::onTokenReplyFinished() {
+    QNetworkReply *tokenReply = qobject_cast<QNetworkReply *>(sender());
+    if (tokenReply->error() == QNetworkReply::NoError) {
+
+        // Process reply
+        QByteArray replyData = tokenReply->readAll();
+        QMap<QString, QString> reply;
+        foreach (QString pair, QString(replyData).split("&")) {
+            QStringList kv = pair.split("=");
+            if (kv.length() == 2) {
+                reply.insert(kv[0], kv[1]);
+            }
+        }
+
+        // Interpret reply
+        setToken(reply.value(O2_OAUTH2_ACCESS_TOKEN, ""));
+        setExpires(reply.value(FB_EXPIRES_KEY).toInt());
+        setRefreshToken(reply.value(O2_OAUTH2_REFRESH_TOKEN, ""));
+
+        timedReplies_.remove(tokenReply);
+        emit linkedChanged();
+        emit tokenChanged();
+        emit linkingSucceeded();
+    }
+}
+
+void O2Facebook::unlink() {
+    O2::unlink();
+    // FIXME: Delete relevant cookies, too
+}