The document discusses five problem spaces related to teachers' digital identities online: managing overlaps between professional and personal identities; developing necessary digital literacy skills; managing online identities when not in control of one's data; whether privacy is still possible; and how the discourse of danger can prevent online engagement. It argues that teachers need to develop their understanding of digital identities to protect themselves, enhance their reputations, make the best use of technologies to connect professionally, and guide students in the 21st century world.