Your collection. Your art. It’s hard to know who’s already seen what.
But chances are if you’re the one actively seeking new stuff you’re the first of your friends and followers to know it exists. If you’re the one making your own stuff then you own exclusive rights to the first share.
My rule of thumb of is, if no one in your inner circle has talked about it yet, just share it. If they are already talking about, just give them credit and share their post. They will do the same for you; online relationships are usually reciprocal.
You are what you discover. You are what you make. You are what you share. Just be careful that you don’t divulge everything. Share certain things only with yourself.