Thank you, I can include something with Google Trends too, but I'm having some problems :

• Google doesn't give raw data : you'll just have the results like in Trends (from 0 to 100, depending on your timeframe),
• Their data is not in real time, so you can really see an increase one / two hour(s) after it has happened.

So Google Trends is good for analysis afterwards but not really in real-time / predicting / decision making.