Social Traffic Helpful for SERP Improving

Yes, Social Traffic helps you a lot for SERP, if we talk about traffic most of the business is generating through social media like Twitter, Facebook, Instagram, Youtube, Pinterest and more. But only creating links on social channels does not increase your traffic or search engine rankings, to gain proper traffic and rankings you must focus on quality content on social channels you are going to deliver to your users.
Social links definitely benefit your SERP, but like diginfoexpert says, the actual benefit is tying the posts you make into something the user can benefit from and associate with your link or brand. Social content moves fast, so things can get buried quickly, and you'll want to make as much of the post as it's being seen for the first time by users.