Ключевые слова: adoption, advertising, age, app, business, cellphone, chat, communication, connection, contact, correspondence, customer, developer, digital, email, engagement, gap, generation, hand, inbox, information, internet, letter, male, man, manager, marketing, mature, media, men, message, mobile, network, new, older, online, phone, receive, send, smart, smartphone, sms, social, spam, specialist, technology, typing, web, website,