There was a Finnish startup called Futureful that did exactly this. They were backed by Skype founder Janus Friis:
Futureful, the AI predictive discovery engine backed by Skype co-founder Janus Friis which we last covered back in…techcrunch.com
Unfortunately Futureful went out of business at the end of 2015.
I’m sure they learned a lot and built some excellent technology for filtering, but the next entrant in this space will have to start from scratch because Futureful’s tech was not open source… That’s an unfortunate side effect of the venture-backed startup model: good tech gets built, doesn’t win big, is lost forever.