The comment you replied to didn't say anything about segregation. And don't say it was implied. Plenty of people of all races would be happier using a social network where the founders care significantly about discrimination.
Historically black colleges were an alternative to colleges that discriminated, but that didn't make them a solution for discrimination in education.
There are articles mind you about how a lack of diversity in product testing meant that some recognition apps work better with some ethnicities than others, this may seem silly, but a minority owned company would be better able to serve minorities precisely because they understand the minority experience.