Ключевые слова: abstract, background, building, cell, cellphone, closeup, concept, content, delete, engine, html, internet, isolated, keyword, link, marketing, media, mobile, online, optimization, optimize, page, pc, phone, position, rank, result, screen, search, seo, site, smart, smartphone, social, strategy, success, system, tablet, technology, telephone, text, traffic, update, web, webpage, website, word, www,