This one is easy to answer but harder to explain. In one word – Facebook. But popular doesn’t necessarily translate into the best social media platform for your brand. Sure you have users, but let’s say your product is meant for working professionals, you’ll have better conversions at LinkedIn due to a concentrated presence of professionals. For entertaining your audience, surely YouTube is the prime source of digital promotion. While high-quality photos gain a large audience on Instagram and Snapchat. As you can see, the answer is multifaceted. The most trending social media platform is dependent on your niche and requirements. But if you had to choose one, then Facebook wins it by a mile for being the most popular and having user-friendly ad targeting features.