Identify precisely what/who the text is about
Identify what people, companies, brands... are mentioned in each comment. Identify the appearance of all types of named entities, abstract concepts, money amounts and time expressions. Incorporate your own dictionaries and detect unambiguously (depending on the context, find out if "Madrid" refers to a city or to a football club).
Classify using predefined or custom categories
Associate each document with one or more categories from a previously defined set (taxonomy). Identify the theme of a comment or to which department of your company it is related. Use pre-integrated standard taxonomies (e.g. IPTC classification for news) or create customized ones.