@hippielou, What's the name of the form of divination where you open a book and read the first thing that pops out at you? Your tweets remind me of that.
*****
According to the Oxford English Dictionary, the word bibliomancy (etymologically from βιβλίον biblio- "book" and μαντεία -mancy "divination by means of") "divination by books, or by verses of the Bible" was first recorded in 1753 (Chambers' Cyclopædia). Sometimes this term is used synonymously with stichomancy (from στίχος sticho-"row, line, verse") "divination by lines of verse in books taken at hazard", which was first recorded ca. 1693 (Urquhart's Rabelais).
Bibliomancy compares with rhapsodomancy (from rhapsode "poem, song, ode") "divination by reading a random passage from a poem". A historical precedent was the ancient Roman practice of sortes ("sortilege, divination by drawing lots") which specialized into sortes Homericae, sortes Virgilianae, and sortes Sanctorum, using the texts of Homer, Virgil, and the Bible.
