You’re allowing Thunderclap to share a single message on your behalf. This is only the case when you click the button on the campaign page to support with Twitter, Facebook, or Tumblr. After the campaign is complete, we won’t post any additional messages.
We only post the message to your feed. We don't post anything from your friends' accounts.
In order to calculate social reach for Facebook, we'll need the "Friend list" permission. We'll never interact with your friends' accounts, store their information, or post on their behalf. We use that permission for the sole purpose of calculating social reach.