Abstract: A target audience for an ad campaign is determined during an exploration period of the ad campaign by modifying the target audience based on the fulfillment of performance objectives. An initial target audience may be provided by the advertiser or determined by the social networking system based on ad campaigns having similar ad content or other similar characteristics. Advertisements associated with the ad campaign are served to users of the initial target audience. A subset of the target audience that fulfills the performance objectives of the ad campaign is identified and those users are used to generate a new targeting audience to target users that “look like” the subset of the target audience. The new targeting audience is used in place of the initial target audience to improve targeting for the advertisement. This process may be iteratively performed to refine the target audience during the exploration period.

Abstract: A process is described for converting scrap flexible polyurethane foam, derived from a polyether polyol, to a homogeneous mixture of polyols which can be used, alone or as a blend with other polyols, in the preparation of polyurethane foams. The process comprises heating the scrap foam with not more than its own weight of an aliphatic diol which has at least one alkyl substituent in the alkylene chain, and which optionally contains an oxygen atom in the alkylene chain. The scrap flexible foam can contain up to about 75 percent of scrap rigid or semi-flexible foam, if desired.