This completely depends on your audience. LinkedIn for example is a platform built especially for networking professionally. It’s a B2B marketers dream with over 70 million decision makers worldwide. That being said, don't automatically rule out the other platforms if you're a B2B company. You’re still dealing with people and those people still use social media in their spare time. If you have a very visual offering, Instagram or Pinterest might be your perfect platform. Despite talk of decline, Facebook still remains the most used platform, and can be a particularly cost-effective option for ads.