facebook graph api - Social Login For Restful API's -

i passing on client id , client secret not able receive access token. doing wrong on here. please tell me have accesstoken , authenticated.

googleconnectionfactory connectionfactory = new googleconnectionfactory("clientid","clientsecret");             oauth2operations oauthoperations =connectionfactory.getoauthoperations();  oauth2parameters params = new oauth2parameters();  params.setredirecturi(""); string authorizeurl = oauthoperations.buildauthenticateurl(granttype.implicit_grant,params);   accessgrant accessgrant = oauthoperations.exchangeforaccess(authorizationcode, "https://my-callback-url", null); connection<google> connection = connectionfactory.createconnection(accessgrant); system.out.println("authorize url is:"+authorizeurl);  google google = new googletemplate(); system.out.println(google.isauthorized()); system.out.println(google.driveoperations()); system.out.println(google.getaccesstoken());