LG 47LA6200 Owner's Manual page 209

1 You can sign in with your LG TV account. If you are not a member yet, please
sign up first.
2 Select a tab from Facebook, Twitter,
connected with other SNS, so you may need the SNS account to sign into the
service.
3 Now, you can view content and post comments while watching TV.
Social Center allows you to write comments while using LG Smart TV services
connected with Facebook or Twitter and to view the comments on the Web or
mobile device.
Activity or Talk. Some functions are