Sentences of a paragraph are given below in jumbled order. Arrange the sentences in he correct order to form a meaningful and coherent paragraph.
A. Targeted advertising is playing an increasingly important role in social media marketing.
B. It wasn't until a few years ago that people began to perceive social media as a marketing tool.
C. Social media has long been regarded as a means of communicating with people via instant messaging and blogging.
D. In marketing, social media is a quick and easy means to share a company's information, such as advertising and products or services available to customers.