I would like to have private tags. That is, tags invisible to others but which are searchable for me. Maybe, they could start with some prefix like —
private- or uid-?
Why I need this: It is very difficult to localize existing good answers. For my tags, there are often excellent answers with 2 votes or less ... So questions are very often reanswered. By permitting my own private annotations it would be much easier to locate those answers. The only alternative I can imagine would be to maintain my own external pages referring back to SO. But before I do that, I'd better ask.