Ключевые слова: abstract, advertisement, background, blue, business, client, communication, company, computer, concept, contact, datum, delivery, design, digital, email, envelope, hand, human, icon, information, internet, invitation, letter, list, mail, man, marketing, media, message, modern, network, offer, office, online, people, post, promotion, receive, sale, screen, sell, send, sign, social, spam, technology, text message, user, viral, web,