It has been estimated that some 81% of Americans used social media as of 2017, and increasingly so. Over one-fifth of an individual's online time is spent on social media, according to one estimate. In 2005, the percentage of adults using social media was around 5%. Globally, there are roughly 1.96 billion social media users. That number is expected to rise to 2.5 billion by the end of 2018. Other estimates are even higher. According to the Pew Research Center, social media users tend to be younger (some 90% of people ages 18 to 29 used at least one form of social media), better educated and relatively wealthy (earning over $75,000 per year). The United States and China lead the list of social media usage:
On the other hand, the integration of social media in the business world can also pose challenges. Social media policies are designed to set expectations for appropriate behavior and ensure that an employee's posts will not expose the company to legal problems or public embarrassment. Such policies include directives for when an employee should identify himself as a representative of the company on a social networking website, as well as rules for what types of information can be shared.
But quitting social media can create new anxieties. “Our research shows that the biggest fear of quitting or pausing social media is missing out,” Bielby says. Some are more sanguine than others. “Do I miss out on stuff?” Morgan asks. “Yeah, of course. People find it hard to keep in contact with me. They say: ‘It would be easier if you had this or that.’ But I don’t think it’s that hard to type in my number and send a text. You’re just not willing to do it.”
A sponsored social media post is when a brand engages an influencer to create content featuring the brand (it could be one post, two posts, or a series of posts) and share it with their followers. There are many forms of sponsored social media posts, from sharing the brand owned content, developing unique imagery, promoting a new product, launching a new brand or generating exposure among a new target market.  
A really comprehensive list and interesting read. It will be interesting to see how this digital landscape evolves, particularly for businesses operating online. I think the rise of messenging apps, such as FB messenger, and the use of bots to automate conversations with prospects and customers is adding a new dimension to digital marketing and will be an area to keenly watch, study and explore, over the next 12 months.
Networks formed through social media change the way groups of people interact and communicate. They "introduce substantial and pervasive changes to communication between organizations, communities, and individuals."[1] These changes are the focus of the emerging fields of technoself studies. Social media differ from paper-based media (e.g., magazines and newspapers) and traditional electronic media such as TV broadcasting in many ways, including quality,[5] reach, frequency, interactivity, usability, immediacy, and performance. Social media outlets operate in a dialogic transmission system (many sources to many receivers).[6] This is in contrast to traditional media which operates under a monologic transmission model (one source to many receivers), such as a newspaper which is delivered to many subscribers, or a radio station which broadcasts the same programs to an entire city. Some of the most popular social media websites are Facebook (and its associated Facebook Messenger), Instagram, WhatsApp, Google+, Myspace, LinkedIn, Pinterest, Snapchat, Tumblr, Twitter, Viber, VK, WeChat, Weibo, Baidu Tieba, and Wikia. These social media websites have more than 100,000,000 registered users.
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