Depends on your target audience. As we are a B2B, we heavily rely on LinkedIn We also tried Facebook, but it didn't really work out for us, which doesn't mean that it won't for you. So, it really heavily depends what your product is about and whom you are targeting.
Twitter works great, if you're working B2B you can also add LinkedIn and try making more connections on Polywork. It's not a social media platform but it's so helpful in this regard.
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