All social networks are good for digital marketing and business although the choice of one depends largely on your product and clientele.you also have to consider the media mostly used by your customer
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It depends on the target audience and the products/requirements.
If you are looking for a good professional in IT field or some other field, LinkedIn is the best place for that and you can place ads, listing your requirements. If you are trying to sell a niche product, then try to look for those particular groups in Facebook or Twitter and contact the owner about the marketing ads. There are many social media platforms out there and you can take your pick. Good luck!