This allows users to connect and build communities on platforms that place little to no restrictions on speech, such as Reddit and 4chan. Daniels points to the internet searches of Dylann Roof, a white supremacist, as an example of how algorithms perpetuate cyber racism. She claims that his internet search for "black on white crime" directed him to racist sites that reinforced and strengthened his racist views.[12] Moreover, Latanya Sweeney, a Harvard professor, has found that online advertisements generated by algorithms tend to display more advertisements for arrest records with African American-sounding names than Caucasian-sounding names.