1. A method for trend detection, comprising: generating a discrete time sequence of word counts for a target word using a trend detection device; performing frequency analysis of the discrete time sequence of word counts to determine contributions of frequency components within different frequency ranges, the different frequency ranges comprising a low frequency range, a medium frequency range, and a high frequency range, to the discrete time sequence of word counts using the trend detection device by: applying a discrete Fourier transform to the discrete time sequence of word counts; and comparing the contributions of frequency components in the high frequency range of the discrete time sequence of word counts to the contributions of frequency components in the low frequency range of the discrete time sequence of word counts; and detecting that the target word is a trending keyword based upon at least the frequency analysis of the discrete time sequence of word counts for the target word using the trend detection device.
1. A method for trend detection, comprising: generating a discrete time sequence of word counts for a target word using a trend detection device; performing frequency analysis of the discrete time sequence of word counts to determine contributions of frequency components within different frequency ranges, the different frequency ranges comprising a low frequency range, a medium frequency range, and a high frequency range, to the discrete time sequence of word counts using the trend detection device by: applying a discrete Fourier transform to the discrete time sequence of word counts; and comparing the contributions of frequency components in the high frequency range of the discrete time sequence of word counts to the contributions of frequency components in the low frequency range of the discrete time sequence of word counts; and detecting that the target word is a trending keyword based upon at least the frequency analysis of the discrete time sequence of word counts for the target word using the trend detection device. 17. The method of claim 1 , further comprising targeting advertising based on at least one keyword including at least the target word using an advertising targeting server system, when the trend detection device detects that the target word is a trending keyword.