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FB is 1 year from its low now but I wonder if it needs 45,maybe a spike in next day or two ? 18 and 45 come from the Gann "circle" and notice how the midpoint of such a move (31.5) was a big resistance level.
 You could also say 18 is 2 times 9 and 45 is 5 times 9.On the lower chart I added some more levels and 18 week cycles (2 times 9)