}
String serverName = Application.NETWORK_HTTP_URL.getValueAsString();
serverUrl.append(serverName!=null?serverName:DEFAULT_HOST);
String serverPort = Application.NETWORK_HTTP_PORT.getValueAsString();
serverUrl.append(serverPort!=null?":"+serverPort:":"+DEFAULT_PORT);
this.service = new ServiceBuilder().
provider(provider())
.apiKey(this.token.getToken())
.apiSecret(this.token.getSecret())
.callback(serverUrl.toString()+"/login/"+socialNetwork+"/callback")
.build();