3 charts that illustrate the Shake Shack cult

Wall Street might be wary of gobbling up Shake Shack stock, but the restaurant has an outsize presence on social media, according to a Goldman Sachs analysis of social media posts about fast-food brands.

Shack Shack dominates a couple metrics compared to large restaurant chains despite its relative lack of traditional marketing.

On Instagram, the self-described "fine-casual" chain had 1,808 followers per $1 million in North American system sales as of about one month ago, Goldman said. This is a far cry from the next largest chain—Yum Brands' Taco Bell, which rings in at 60.

Meanwhile, it also has the most Vine followers relative to North American system sales and the highest average Yelp review versus local burger competition in its main New York market.

Despite this, Wall Street has expressed reservations about the stock, citing concerns about valuation and the risk that surrounds a large expansion.

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Just one out of the eight analysts who cover the stock have a "buy" rating on the burger chain's shares, according to FactSet.

The next big test for Shake Shack shares will come March 11, when the company delivers its first earnings report.