Way back in 2006-2007 what one did to promote one's domain on a plethora of social media platforms did, in fact, significantly improve the SEO of a given domain
Post Google Panda, not so much
it appeared to be a loop hole, one that Google saw as a threat to their business model, and Google closed much of the loop hole
For instance, in 2007 you could make a domain, share a link to that domain on Digg.com and within hours or minutes it would not only be indexed, but the link coming from Digg gave the newly created website "authority" in the Google ranking algorithm's eyes.
adding an image to help describe your blog post did something in terms of imagery created in the human observers eyes, but Google's AI cannot "parse" the meaning of an image
but taking that same image, adding a keyword stuffed description of said image, adding tags ( also keyword stuffed ) to that image ( Hosted NOT on YOUR website, but hosted FROM Yahoo's Flickr) and "pulling" the image from Flickr (embed in your blog post the image hosted from Flickr) was one of my most effective SEO tricks
not so much now
so I'm publishing a reenactment of my previous position and now refer you to this authoritative post on the Social Improves SEO from Stone Temple
Frederick Web Promotions SEO Strategist David Bruce Jr
Local Google Advertising-
Google that phrase, then Call 240 397-0148 If you want YOUR company website to perform that well in Google.
Social media optimization (SMO) is an imperative ingredient of your SEO campaigns. In the past, social networking sites were little more than an oddity. Today, several have received enormous ranking authority from top search engines. If you are not leveraging these sites to increase your exposure and communicate with your niche market, your search engine positions are vulnerable to your competitors.
In this article, we will describe the influence that social media optimization is currently having on search marketing. We'll also give you the rules of engagement for executing an effective SMO campaign. We'll explain what SEO social media is, and the advantage of hiring an experienced SEO consultant to spearhead your social media optimization efforts.