  <p>
      Implementations that publish Activity Streams 2.0 documents SHOULD
      assume a default position of limiting both the kind and amount of
      sensitive personal information included in the document unless users have
      "opted in" to sharing additional detail.
    </p>

    <p>
      Implementations that consume Activity Streams 2.0 documents SHOULD NOT,
      by default, store or share sensitive personal information included within
      consumed documents unless users have "opted in" to a