It all depends on your business industry, marketing objectives, and individual preferences. Influencer marketing can be carried out on any social media platform. So the right platform for your campaign depends on your target audience because if you choose a channel that does not cater to your ideal customers, your campaign won't generate the desired results. For example, if you're a B2B business, you'd probably want to choose an influencer from LinkedIn, Twitter, or both. But if you're a B2C or D2C brand, you can go for Instagram, YouTube, or Facebook, influencers.
Brands can also find and engage influencers from one platform and then recreate their content and publish it across other platforms, targeting a different set of audience. Here, you will be helping the influencers to build and grow their communities on the platforms they were not active.