Those are two very different companies, though. It's not like the average consumer can make any sort of buying decision that will affect an aerospace company, but they can certainly patronize or boycott a department store. Plus Boeing likely does a lot of business with the federal government which Trump is now head of, while retail outlets are highly unlikely to be directly affected by anything a President does.

That's true, which means any algorithm would also have to take the nature of the company being tweeted about into consideration.