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As palavras-chave são um tipo específico de meta-tag que aparecem no código HTML de uma página da Web e ajudam a dizer aos motores de busca quais são os tópicos da página.
No entanto, o google não pode usar palavras-chave meta.
Social
Dados das redes sociais
O custo e a sobrecarga anteriormente tornaram inviável essa forma de comunicação semi-pública.
Mas os avanços na tecnologia de redes sociais a partir de 2004-2010 tornaram possíveis conceitos mais amplos de compartilhamento.