Online-activity-generated digital traces provide opportunities for novel services and unique insights as demonstrated in, for example, research on mining software repositories. The inability to link these traces within and among systems, such as Twitter, GitHub, or Reddit, inhibit the advances in this area. Furthermore, no single approach to integrate data from these disparate sources is likely to work. We aim to design Foreseer, an extensible framework, to design and evaluate identity matching techniques for public, large, and low- accuracy operational data. Foreseer consists of three functionally independent components designed to address the issues of discovery and preparation, storage and representation, and analysis and linking of traces from disparate online sources. The framework includes a domain specific language for manipulating traces, generating insights, and building novel services. We have applied it in a pilot study of roughly 10TB of data from Twitter, Reddit, and StackExchange including roughly 6M distinct entities and, using basic matching techniques, found roughly 83,000 matches among these sources. We plan to add additional entity extraction and identification algorithms, data from other sources, and design tools for facilitating dynamic ingestion and tagging of incoming data on a more robust infrastructure using Apache Spark or another distributed processing framework. We will then evaluate the utility and effectiveness of the framework in applications ranging from identifying malicious contributors in software repositories to the evaluation of the utility of privacy preservation schemes.