Ключевые слова: background, black, blackboard, blackboards, board, book, business, chalk, chalkboard, chalkboards, class, communication, community, concept, connect, connected, connecting, connections, contact, design, drawing, education, face, friends, global, graphic, group, horizontal, icon, illustration, information, internet, learning, media, multimedia, net, network, networking, online, organization, people, person, school, sign, social, social media, symbol, team, teamwork, technology, text, together, web, white, work, write, writing,