The global Internet population grew 18.5% from 2013-2015 and now represents 3.2 Billion people. We are creating a huge amount of data and we are constantly developing ways to create more data.
Big data is not a precise term; rather it's a characterization of the never-ending accumulation of all kinds of data, most of it unstructured.
It describes data sets that are growing exponentially and that are too large, too raw or too unstructured for analysis using relational database techniques alone. The current issue is not acquiring large amounts of data. It's what is done with big data.
You can read more about big data here