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It can be used before hand. The purpose of the new tags are to ease our curation work for a specific category, you may read this post about it:

https://steemit.com/photocircle/@photocircle/photocircle-project-update-new-tags-for-top-10-daily-contest

Take note, we prioritze the new specific tags and highly recomended by us for you to use it :)

Thank you for replying. Great! This motivates me even more to participate. Cheers!! :)