Is it illegal to buy and perform magic tricks on business social media sites? I have a business unrelated to magic. I want to perform magic on my business social media sites as I think that would draw attention and get more visitors.

I would like to perform for my members and then post to my FB and Instagram. It will have that street magic feel but instead of the streets it will be for the members of my business. And I get new customers coming in often.

Illegal, almost certainly not. Otherwise magic on YouTube would be very different.
Magicians complaining about it... almost guaranteed. At least somewhere.

I don't know that I'd worry about the complaints though, but if I had my way I'd like you to not explain HOW you did it.

I would never reveal how a trick is done. I would not under any circumstances post a tutorial of someone else's effect. I just want people to see me performing for my clients via youtube or instagram.

I would doubt it is much of an issue.