The Twitter status sample (https://dev.twitter.com/streaming/reference/get/statuses/sam...) is a reasonably unbiased sample (https://arxiv.org/pdf/1306.5204.pdf). You'd have to learn 6 or 7 languages to really follow it, but there are some ways to filter it to English-only.

Also useful is https://www.reddit.com/r/all/top/?sort=top&t=day, a bit US/tech-biased but definitely a few million.