In a dilemma over these two friends.Can you help me make a decision please?

[CuriousKat]

I changed some of the details to protect the identities of my friends. I'm not sure how to proceed and I need advice.
A friend of yours has a small start up business making handmade items. They take their product and they sell on the side at their workplace and everyone likes them because of the quality.
You find out that a friend of the first friend is at the same workplace. And this second friend, let's call them B, saw your friend(A) selling their things and was like "that's a really good idea" and then got into the same business.
You find out by accident that friend B has been doing unsportmanlike, unbusinesslike, underhanded things like not telling persons in the workplace that they are not partners with friend A and letting people buy from them thinking they are working with friend A. Tells people that friend A buys their products from some cheap rate store in china instead of making them by hand and when your friend had the chance to branch out and get their products in a craft centre B ousted them out to their products accepted instead.
You also find out that a friend of friend A(who also happens to your friend and a friend of friend B) has warned friend A that friend B has been known to do much worse to competitors.
Only after finding all of this out, did you realize that you were supporting the business of B on social media because they were of the same denomination as you. After you found out all of that you stopped supporting them.
And only after some amount of time had passed you found out that friend B is actually someone you know(you didn't know who owned the business exactly) and is still on all your social media.

Considering that you know friend A needs the money a whole lot more than friend B because friend A has a large family and the handcrafted items are made by most of the adults of the family in an effort to support themselves(the salary at the workplace is not much).

What do you do? Do you delete the person? Do you confront the person? Do you just leave them on your social media? Do you let others know what they do? What would you do?
I found out about what was happening when friend A was talking to one their old advisors at school who asked how the business was going and I happened to be in the room(friend A isn't bothered by me and knew I was there) so they already know what the person is doing...I can support them by sending my friends to them rather than the other small business but friend Bs business is a larger one deals with larger orders for items. While friend A focuses on a niche and has smaller orders(friend B does make some of those items but does not mainly focus on them and has several different products)

[Edgar Manzo]

I would say confront her but not in an angry way like "you shouldnt be saying things like that she trys her best to keep her family happy you stole her idea and lied about her" or just delete her thers alot if ways to setteling things like this

[Kia]

I wouldn't associate with friend B any longer he is a liar and a schemer why would you want to associate with someone like that. The whole situation is how business is done really, its messy people lie cheat and steal to make a buck. Friend A should have branded and patented his products so friend B legally couldn't rip them off. Confrontation probably won't do much and you would have to have irrefutable evidence to display if you want to ruin someone reputation otherwise people may not listen to you.

[VampireGirl96]

I would warn people and make sure people know that person A started it first and that the things Person B has been saying are lies.

Of course it may be best to just stay out of it you are after all the third party and this could be considered as poking your nose in.

[Sunshyne]

I would remove friend B from your social media and cut contact. That person sounds very shady and underhanded and I wouldn't want that kindof manipulative person in my life in any way. I would tell friend A what you found out and let friend A decide how to handle it. If you do post anything about friend B on social media or tell people, be sure to have your facts straight. Since he's a business owner, you don't want him to come at you and sue you for slander.