Google Trends

Google Trends is a way of exploring whether terms are in the public eye, and lots of people are searching for them. The appearance of certain news stories can be tracked by looking for them on the Google Trends search. They show how certain events grabbed attention, or how certain words or trends appeared and fluctuated over time.
Here's an example for the Eyjafjallajokull eruption... Worldwide mentions since 2004...

The results can also be shared in different ways, including embedding them.
Here's Brexit