Should I post the data my project was tested on in the paper? I created an algorithm for predictive analysis based on text. I'm making a paper out of it. I have the textual data my algorithm was tested on and compared with other algorithms tested with the same textual data. Should I post a link of this data in my paper or should I just state that I have tested it and here are the results?
If you can make the data set available to the community in some way, you are doing it a good service, because it will allow other people to use your dataset for comparison and for their own new works.  If they find it useful, it will also help you, as the people who use it will cite your paper as the source.

I would thus say that yes, if you have a good way to either post it online or attach it to your paper as supplementary information, this this is a good thing to do.