Once you have a clear picture of your objectives and audience, you can choose the best social media platforms and formats for your media buying. You should consider the strengths and weaknesses of each platform, the demographics and psychographics of their users, the types of content and ads they support, and the costs and benefits of advertising on them. For example, Facebook has a large and diverse user base, but also a high level of competition and ad fatigue. Instagram is great for visual and creative content, but may not be suitable for complex or technical topics. YouTube is ideal for video ads, but requires high-quality production and optimization. You should also consider the different formats and placements available on each platform, such as stories, reels, live, carousel, video, display, native, or sponsored.