It means subscribing. It for when you find a thread interesting but don't have anything to say on it yet. When you post something then you get the emails when someone else posts. Does this make sense?
Secret Sisters Winter Swap
MN Vikings fan (although very disappointed this season)
I Thessalonians 5:16-18: Rejoice always, Pray without ceasing. Give thanks in all circumstances for this is the will of God in Christ Jesus for you.