Ключевые слова: advertise, advertising, affiliate, alphabet, billboard, blackboard, board, capital, chalk, chalkboard, classroom, click, commerce, communicate, communication, content, device, engine, handwriting, indoors, information, internet, letter, management, message, mouse, network, nobody, online, pay, per, ppc, process, sale, school, search, social, system, text, topic, traffic, visitor, web, webpage, website, word, www,