This is just pure marketing and a good story for newspapers (i.e it help selling newspaper).
The list of issues for being anywhere near a generic automatic sentiment algorithm is huge and growing.

What makes it worse is that the web is becoming more and more social i.e organized in communities that all develop their own context, code and make it very difficult to analyze.

Let’s say I tell you:

“This new- technology is as great as automatic sentiment”:
- in marketing communities, it’s probably positive
- in the scientific community, it’s probably negative

Best
´s last blog ..Cats, Dogs and Social Media