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If you were talking about Saudi Arabia, I would definitely say Twitter/Snapchat. I do not know much about the e-social life in Dubai, however, I think each platform provides a certain set of tools.
A digital marketer needs not only to understand his customers' preferences, but also well understand the available social media platforms. Hence, you can make advantage of the platforms variety and integratedly use all of the platforms to support your campaign.
Also, some customer prefer to use Facebook, others prefer Twitter, and others spend most of their times on Instagram. The more you're present on many platforms, the broader you're communicating with customers.