I paid for the 30x500 course (so far not worth it :-( ... it anyway the point of the whole thing is to first identify your audience, then find where they hang

I paid for the 30x500 course (so far not worth it :-( ... it anyway the point of the whole thing is to first identify your audience, then find where they hang out online and then do this kind of research. This coukd be linked up with Rand Fishkin's new thing where he has found a million people's twitter bios and linkedin bios and can therefore find "people who post a lot about sailing and work in finance". But honestly, it casts a wide net and I think I need to niche down.