Keyphrase extraction is one of the techniques that can meet this demand, because it is defined to identify salient phrases, generally formed by one or multiple words, for representing key focus and main topics for a given collection (Turney, 2000;Zhao et al., 2011).
for microblogs, keyphrase extraction has been proven useful to downstream applications such as information retrieval (Choi Target post for keyphrase extraction: "I will curse you in that forum" is the lowest of low.