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I keep looking too! And keep entering the same category. Hah!
I figure it has something to do with the fact that this tag is so widely used?

Ooohh, good point! That would get annoying to try to filter. Maybe the contest tag could change each week to include the weekly theme, to filter the ones that actually pertain to the contest? like #smartphonephotographytrees. Just a suggestion @juliank