Given the above requirements, how would you build such a system?
You will only hear what they want you to know, rather than what the truth is.
You would need to be a fly on the wall at the company's meetings, rather than rely on their press hand-outs.
Would you expect them to broadcast the fact that they will be out of cash and bankrupt within two months? What would that do to their staff numbers? What would that do to their stock prices?
You need a mole/industrial spy inside the company to get whatever it is that you seem to want.
Part of the key would be able to detect the “dogs that don’t bark” - Twitter accounts you previously identified as being tied to a company suddenly not saying things for example.