This invention provides estrogen receptor modulators of formula I, having the structurewhereinR1, R2, R2a, R3, R3a, and R4, and X as defined in the specification, or a pharmaceutically acceptable salt thereof. A user is initially prompted to utter N characters of a search query, andor to enter these characters on a telephone keypad. Rank the keywords of the first network resource according to their relative degrees of popularity based at least on a number of the network resources tagged with the keyword.