The tour describes the site as follows:
Data Science Stack Exchange is a question and answer site for Data science professionals, Machine Learning specialists, and those interested in learning more about the field.
Capitalizing "Data" but not "science" seems wrong. It should be either both or neither. Ideally, "Machine Learning" part would be consistent with that.
I suggest lowercasing it:
a question and answer site for data science professionals, machine learning specialists, ....