Ключевые слова: assistance, best, business, choice, choose, client, comparison, concept, consumer, customer, emoticon, emotion, employee, enjoy, evaluation, excellent, experience, face, feedback, finger, good, happiness, icon, ideas, internet, marketing, new, opinion, perfection, performance, positive, product, quality, questionnaire, ranking, rating, result, review, sadness, satisfaction, service, sign, success, support, survey, symbol, technology, trust, user, wood,