Background: The Metastatic Breast Cancer Project is a nationwide research study, launched in Oct 2015 in collaboration with patients (pts) and advocacy groups, that directly engages pts through social media and seeks to empower them to share their experiences, clinical information, and samples to accelerate research. Methods: MBC pts enroll by providing their information at mbcproject.org. Pts are sent a saliva kit and asked to mail back a sample which is used to extract germline DNA. We contact pts medical providers and obtain medical records (MRs) and stored tumor samples. Pts may also submit a blood sample, used to extract cell free DNA (cfDNA). Whole exome sequencing (WES) is performed on tumor, germline, and cfDNA; transcriptome sequencing is performed on tumor. Clinical and genomic data are used to generate genomic landscapes in pt subgroups and to identify mechanisms of response and resistance to therapies. Data are shared widely through public databases. Pts receive regular study updates. Results: In 12 months, 2908 MBC pts from 50 states enrolled. 95% completed the 16-question survey about their cancer, treatments, and demographics. 1730 (60%) completed the online consent form. 100-200 pts continue to enroll monthly. To date, 1539 saliva kits were mailed and 1120 samples were received (73%). 992 unique treating institutions were reported by pts, including 733 institutions reported by only 1 pt each and 5 institutions reported by more than 40 pts each. We have obtained MRs from 253 patients (67% yield) and tumor samples from 85 pts (67% yield). WES was successfully completed for 79 tumors of 88 attempted (90%). WES has been performed on initial cfDNA samples. Conclusions: A direct-to-patient approach enabled rapid identification of thousands of MBC pts willing to share MRs, saliva, and tumor samples, including many with rare phenotypes. Remote acquisition of MRs, saliva, tumor, and blood for pts located throughout the US is feasible. We estimate that for ~33% of consenting patients, we can obtain medical records, saliva, and tumor tissue. Genomic analysis of tumor and cfDNA from subgroups including young pts, pts with extraordinary responses, and pts with de novo MBC will be presented.