Ключевые слова: abstract, background, business, cell, communication, concept, consult, development, digital, double, drawing, electronic, email, envelop, exposure, finance, flow, form, hipster, icon, internet, machine, mail, man, message, multi, office, online, opportunity, phone, relation, research, security, sell, send, smart, social, spam, stats, surf, symbol, tablet, telephone, touchscreen, training, trust, wallet, wallpaper, web,