When you talk about discerning between algorithms from Google, Stanford, etc... what's the criteria for doing that? Does it change based on the domain? if you are just trying to classify feedback how much the domain affects the algorithm?
As far as the domain affecting the algorithm, it can vary from some algorithms maintaining decent performance over most industries, to some algorithms working very well for some industries and terribly for others. Although it is just feedback, the topic of the feedback and even the ways people talk about the same topic (such as price of the product) will vary across each industry.