Our tools are missing context and deeper search. For instance, answer me this question about your Facebook account: which of your friends are in both of any two groups you choose? Or did any actors play in both of two given movies? That's "cross-referencing", and almost no program or website does it. Google sort of does, but only for keywords in documents, and there's a lot of data that is not kept in documents like that. It's an essential tool if you want to go beyond merely finding information and understanding it or comparing it with other information. We need our software to do this.
Mokalus of Borg
PS - My own software doesn't do this either.
PPS - Except that one basic file search tool.