Data smog refers to an overwhelming amount of data and information - often obtained through an Internet search - whose volume serves more to confuse the user than illuminate a topic. Data smog is a term coined from a book written by the journalist David Shenk, which deals with the influence of the information technology revolution and how the vast amount of information available online make it increasingly difficult to separate facts from fiction.
Techopedia explains Data Smog
The amount of data available on nearly any topic today is overwhelming, and while it can be advantageous, this constant bombardment can also have side effects that are not unlike air pollution in that they are gradual, insidious and largely invisible. These include impaired performance and increased stress. Experts have provided tips on how to avoid the effects of data smog. These include:
Spend some time away from communication devices, the Internet and the television
Try going on "data fasts"
Browse through newspapers and magazines and cut out the articles that you want to read and learn about
Make use of filtering for unwanted emails
Do not send or forward urban legends, chain letters or any useless information to others