This is something you need to pay attention to on every platform, because if you are posting too much or too little, you are putting yourself at a disadvantage.
Before reading this know what you post does typically matter than how much. If you are posting bad content people will not continue to watch. If you are posting good content people will watch. Even if a bad piece of content does well that does not mean it is repeatable.
So let’s go through all of the top socials and get an idea.
Facebook: As much as possible. I have really been studying Facebook monetization the last few months, and EVERY time I see accounts talk about making thousands, they post as much as once per hour. (See attached video of someone making thousands per month on ads.) However, there is a caveat here, at least for me. You do not want to be annoying or post slop. So personally, I post once per day, but if I have the bandwidth to post more than that, I do not usually hesitate. Sometimes up to 3 posts per day, but spread out.
X (screenshot is a post from head of product Nikita): This one is tricky because you will see a lot of contradictions, like big accounts posting slop such as one word posts multiple times an hour. Usually it is either bots, or there is a point where if you are big enough, algos almost do not matter. That said, I find that high quality posts in the morning, afternoon, and evening work. Usually, if you post something very relevant, it also does well, but the algos changed a few weeks ago and hurt discoverability. I recommend one good post, pin it, one good afternoon post, and one evening post if they are all quality.
YouTube: Once a day long form and as much as you want short form, just not back to back. You could do 3 short form a day and not get punished. You could also do multiple long form, but it just depends on your content, and ultimately focusing on one video as opposed to getting multiple out, especially for smaller creators, is the way to go.
TikTok: Similar to YouTube shorts, you can post multiple a day. Just make sure they are not back to back.
Instagram: I recommend one high quality post per day but once you get established you can do up to 3 a day.
I would like to clarify this is all from thorough personal experience and there is a lot of nuance.
Lastly, if you see this on any other social media it's ultimately exposure to get more people to join us here in this community.
Eventually this will be the only source of this style of content.