3

Sometimes I am invited to post a link to my answer to Facebook and Twitter and other times I am not. What decides?

2

See

https://meta.stackexchange.com/a/80910/1

This only appears:

  • a random percent of the time, decreasing chance with greater reputation
  • on your posts
  • if they are greater than 400 characters in length
  • for 1 hour after posting

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