I always thought that a diary-by its very nature-is secret-because it is personal.....but that does not mean that everything that is written in it is ONLY secrets.
Britannica Concise Encyclopedia: diary
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Record of events, transactions, or observations kept daily or at frequent intervals; especially a daily record of personal activities, reflections, or feelings. Written primarily for the writer's use alone, the personal diary usually offers a frankness not found in writing done for publication. The diary form, which began to flower in the late Renaissance, is important as a record of social and political history. The most famous diary in English is that of Samuel Pepys. Other notable journals include those of John Evelyn, Jonathan Swift, Fanny Burney, James Boswell, Andr� Gide, and Virginia Woolf.