Ключевые слова: advertisement, advertising, app, application, browsing, call, casual, cellphone, cellular, chat, commerce, commercial, communication, conference, confident, connection, conversation, discussion, education, elearning, finance, investment, learning, meeting, messaging, mobile, network, online, phone, photo, picture, school, selfie, shares, smartphone, social media, speaking, student, study, technology, teenage, teenager, telephone, trade, trend, university, video, video call, webcast,