Social Media, from the 1980s
In 1984 Commodore UK launched a service called Compunet. Compunet offered downloads, information pages, electronic mail, bulletin board systems, online gaming and chat rooms. All a UK home user had to do was buy a modem for their Commodore 64, make an adjustment to their phone line and away they went.
Compunet also offer users the exciting prospect of teleshopping, telebanking, the buying and selling of real estate, insurance quotes, and much more.
Amazingly, given the recent discussion surrounding Google +1, the Google Panda update, and social media in general, Compunet actually allowed users to vote on content, ala a Facebook Like or a Google 1+. In 1984.
