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Loading Time belongs to the most important ranking factors because it affects the UX.
You should keep to be always updated and the best is to follow a course liked click minded
Pinterest, Instagram & Facebook!
It always depends on who your customer is.
A B2B or B2C?
LinkedIn for B2B
Twitter for B2C
But the most important aspect is to know the audience.
Facebook, Instagram and Pinterest offer a product feed functionality.
First, you should know where your audience is because there is no the best social network, but the social network where your audience is.