The consumer research guide is a best bet for finding information about consumers.
More specifically, the "Consumer Behavior" page listed on the consumer research guide provides excellent resources for investigating demographic and psychographic trends across different industry segments.
Insider Intelligence is the best resource for finding information such as:
- Facebook users, by sex
- Instagram users, by age
- Esports viewers
- Twitter users, by device
- Snapchat video ad revenues
Statista is also a great resource for finding information about "Consumers & Brands" and "Consumer Markets".