Metcalfe's law – Value of a communication network is proportional the square of the number of pairwise connections During these days, people are forced to stay at home and the social media have connected and supported awareness and pandemic updates."[67] CompuServe, Prodigy, and AOL were three of the largest BBS companies https://robertoroosevelt.wordpress.com/2024/01/29/midias-sociais/