I think it's going to be terrible at that :( Separating SEO spam from useful products isn't a strength of LLMs.
Probably a normal prompt without deep research would be better for that (but less recent), especially for topics that humans previously discussed a lot in the past (like on pre-AI reddit). Signal to noise ratio is only going to go down, down, down from here... :(
I don't think you'll get useful results from deep research in a case like this, trying to distinguish between all the contemporary advertisers and cut through the spam. Deep research is good at summarizing sources, and it works well if you can tell it what kind of trustworthy sources to focus on. It's not so good at judging the relative merit of each source. And in this case, there are no trustworthy sources... it's all just spam. If you manage to get good results out of it for market research, you should probably just start a business and become a billionaire selling that functionality instead of whatever you were researching :)
Probably a normal prompt without deep research would be better for that (but less recent), especially for topics that humans previously discussed a lot in the past (like on pre-AI reddit). Signal to noise ratio is only going to go down, down, down from here... :(
I don't think you'll get useful results from deep research in a case like this, trying to distinguish between all the contemporary advertisers and cut through the spam. Deep research is good at summarizing sources, and it works well if you can tell it what kind of trustworthy sources to focus on. It's not so good at judging the relative merit of each source. And in this case, there are no trustworthy sources... it's all just spam. If you manage to get good results out of it for market research, you should probably just start a business and become a billionaire selling that functionality instead of whatever you were researching :)