Ключевые слова: background, black, blackboard, board, business, chain, chalk, chalkboard, chart, communication, community, computer, concept, connect, connection, data, diagram, drawing, education, flow, friends, friendship, group, handwriting, illustration, internet, knowledge, learn, link, linked, meeting, network, networking, organization, people, plan, presentation, sketch, social, success, teach, technology, text, web, white, word, www,