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Hello Aya, Thank you for your invitation. It depends on business objectives. For B2B its LinkedIn on the top and for B2C Facebook and Twitter.
There are main four players in Social Media Facebook , twitter , LinkedIn and Google +. Google + is important for your website to be indexed in Google very fast. The post shared on Google + , can also be find in Google search after some days.
The best idea to choose best social media for any business is to start all four at the same time , which will help you to know which platform is working after analyzing traffic and conversions.
For marketing it is (1) Google+, (2) Facebook, (3) Twitter, (4) Pinterest
Facebook and twitter are the best