Final answer:
The Advanced Research Projects Agency Network (ARPANET) was established in the 1960s to meet Department of Defense message service requirements, which later evolved into the modern internet and social media.
Step-by-step explanation:
In the 1960s, the Advanced Research Projects Agency Network (ARPANET) was established to provide a secure, automated, store-and-forward message service to meet Department of Defense operational requirements. This network is significant as it continued to serve as the backbone for organizational message exchange and laid the groundwork for the development of the modern internet and Social Media. The ARPANET included advancements in computer networking, and helped catalyze the creation of the World Wide Web in the later years. Although initially limited to government and academic circles, this technology quickly expanded and by the 1980s, the communications protocols became standardized leading to what we now know as the Internet.