From an article touting the value of data mining in the era of BigData:
Whatever data mining tool you use for creating sales leads, remember that the tool is only as good as the data in it.
The old principle of garbage in, garbage out applies to both small and big data. But with the advent of BigData, tools are not yet on par with the needs.
Original title and link: Big Data and Data Mining: Garbage In, Garbage Out (NoSQL databases © myNoSQL)