1. A method for trend detection, the method comprising: receiving, by a computer system, a seed expert set including expert contributors to social media content with respect to a category; identifying, by the computer system, second tier set including highly influential users with respect to content from the seed expert set; identifying, by the computer system, new concepts in content generated by one or both of the seed expert set and the second tier set; monitoring, by the computer system, trends for the new concepts in activity of a general population of social media users; and outputting, by the computer system, a representation of at least a portion of the trends for the new concepts.