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Thanks for your reply. what's the best time to post? in GMT please

It's a fairly moving target, and depends on your number of followers and audience somewhat, but morning on the US East Coast is generally a good time. So, 12:00:00 - 12:30:00 GMT would be my guess. But again, it really depends on your audience, and how long you've been around, how engaged you are, etc. Good luck!

OK, thanks so so much @lovejay