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Here are three groups which I have joined on Facebook - by all means mention that I referred you to their pages. Never hurts. They are members only so you need to apply as it were. Through the posts on each you will find all sorts of contests both national and international
Twitter is harder of course but I think you will find a good selection here - they are all three proper writing groups. They seem to like our winners stories any way, you will find them in there! If you are looking for a larger audience, tell me what you want to write. You might have seen my post about The Steemian - it is a real pain that this month is going to be so crap as I plan to launch issue 1 at the end of April.
Wishing you a great weekend.
Tjhank you for supporting these contests - people like you make them really fun and worthwhile. Namaste.
True Short Short Story
Short Story America
Thresholds