I've joined an online writing group called Scribophile, where you can share you work with others to be critique. It's open to anyone, and what you share is public until you can join private groups. If i put my work up to be critiqued on this online community, will agents consider it tarnished? Or unpublishable because it's already been shared?
As long as you don't attach an ISBN and print it up and sell it, (or the electronic version of print it up) you're fine.
On the other hand.
I'm VERY hesitant about just letting random people critique your work.
Criticism can cut you to the quick, and letting random people flail at you with knives seems like something to avoid.
Second, you don't have any idea of the quality of their work do you? Someone who can't string sentences into paragraphs isn't someone I want telling me how to write.
Third, hives like that tend to reward bland, middle of the road, unexciting writing.There's nothing "wrong" with bland; it's just not very interesting. It's when you break the rules with elegance and style that you get my interest. Breaking the rules on those kinds of sites isn't always viewed with the same enthusiasm.
The commenters today will probably have advice based on actual experience with sites like this. I'd pay attention to what they say particularly if they don't agree with me.