Private vs. Public Sticky notes are either PRIVATE (default), PUBLIC, or GROUP. Private sticky notes are viewable by the author and any forwarded recipients. Public sticky notes can be seen on the page by all Diigo members with the Diigo toolbar or Diigolet installed, and its viewing mode set to "All". The highlights associated with public sticky notes also become PUBLIC, i.e., viewable to all Diigo members. Public highlights and sticky notes should be done with care. To minimize graffiti and spam, we have raised the bar for making public highlights and sticky notes: you need at least two friends in the Diigo community to do so.