Foster was born and raised in Oklahoma City.[1] In 2010, as an undergraduate at Harvard University Foster created a blog called For Harriet, where she planned to "provide an online community for women of African descent to engage in honest dialogue about the complexities of Black womanhood".[5][8] Her blog grew into a website of five properties as of February 2017.[9]
Foster's writing centers social issues and has been cited in outlets such as Ebony and The Week.[10][11] Her work has also been noted in the books The Language of Strong Black Womanhood: Myths, Models, Messages, and a New Mandate for Self-Care,[8]Color Stories: Black Women and Colorism in the 21st Century,[12]Revives My Soul Again,[13] and Diverse Bodies, Diverse Practices.[14]
Foster created YouTube and Patreon accounts for For Harriet in 2018.[15] She stated that the accounts generate $25,000 monthly in revenue.[16]
In 2021, the For Harriet channel was awarded a #YouTubeBlackVoices creator grant in recognition of Foster's work connecting popular culture to Black feminist thought.[17]