1. A method performed on a computing device, the method for selectively providing an aggregated trend obtained from at least a subset of a plurality of individual trends, the method comprising deciding whether to provide the aggregated trend by determining whether an individual trend in at least the subset of the plurality of individual trends can be at least partially identified from the aggregated trend, the determining comprising: clustering at least the subset of the plurality of individual trends to obtain a plurality of clusters; identifying a first cluster in the plurality of clusters as a most similar cluster to the aggregated trend based on a similarity measure that indicates a similarity between two trends; and where the deciding comprises deciding to provide the aggregated trend if there are at least three individual trends in the first cluster.