Abstract: Techniques provided herein allow for a plurality of weighted samplings without replacement to be performed in O(n) time. According to some embodiments, the weighted sampling without replacement may be performed on a data set X of data elements {x1, x2, x3, . . . , xn}, where each data element xi of the data set X has an associated weight wi. The data set X may comprise data generated by a social networking system. Each data element xi in the data set X may be assigned with a random score si based on the weight wi associated with the data element xi. The random score si can be used to perform weighted sampling without replacement.