Twinternship

What Does it Mean?
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An internship in which the intern is charged with using social media such as Twitter and Facebook to drive attention to a company and its products. A twinternship is usually an unpaid (although paid positions are not uncommon), temporary position in which a "twintern" will use popular social media outlets to publicize products and promotions for a business. 

Investopedia Says:
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Twinterns usually work as a part of a company's public relations team. Twinternships have gained popularity as a cheap and relatively easy way to communicate a company's brand with younger, tech-savvy consumers. Some companies have even held promotional contests to award similar paid positions to young twinternship hopefuls.