In the late 1970s, hackers forged a social media network using the dominant audio tech of the time — the telephone — POV: You’re a 14-year-old kid in Atlanta. It’s 1978, and the internet hasn’t been invented yet, so you mostly get your kicks over the phone. You love to call up your local radio station, WQXI, to request your favorite oldies. This time, however, the line’s been disconnected. A prerecorded message…