We have dozens. Countless companies have tools to show you how things are happening on social media, and all the big new outlets mirror their content to social media. At the most simple level, basic word counts can track how issues appear and disappear. When you hear about a 75% drop in coverage of "Biden v. Trump" that is almost certainly taken from the number of times those two names are included in news reports. Counting words or highlighting the use of new words does not require AI.