Facebook and Twitter both are good social site for promotion but i will go with twitter because you can find more organic and relevant audience related to you subject (Product or Services).
It's up to you that how you are going to use the platform. All social media platform are good to drive traffic to your website. i'll recommend you to use these 4 social media platform.
1. Quora
2. Reddit
3. Facebook
4. Twitter
These platforms do really help me to drive traffic to my website.
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