I remember the firehose and $<Ticker> symbols, good times. Though it didn't last. If I remember correctly it lost its predictive value around 2014.
Bloomberg came out with a sentiment product right around then and nlp libraries got good enough that anyone could do it in under a month of work, heck now you see weekend projects almost daily on reddit of people who are still trying to do sentiment analysis on twitter, mostly for crypto to trade off of.
There was a time a few years ago when you could use the Robinhood hot list to trade from, well technically you'd trade against it as what was hot on Robinhood inevitably crashed as those types of trades have no conviction or fortitude to hold and they're always pulling money to put it into the next shiny thing, ex GME of course, that one seems to have sticking power!!