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If you are talking about the best platform for promotion then the first platform that comes in your mind is Instagram. 90% of the Instagrammer use this platform to promote business and services or create their own fan base.
There are a number of websites are available where you can buy Instagram likes but I would suggest you to take it from https://www.helpwyz.com/service/buy-instagram-photo-likes/ because of its quality services at an affordable price.