Social workers currently comprise the largest professional group in public mental health services.

That statement is true

Explanation:

By the end of 2018, more than half of workers who works in mental health services are social workers (such as workers from child services, Addict groups sponsor, suiccide hotline workers, Volunteers, etc)  , and they either works using funds from the government or doing their services pro-bono. Only small percentage of them work for profit.

This large percentage is directly correlated with higher amount of mental health issues experience by average people, which often associated with Internet/social media usage.