The general causes of information overload include:
A rapidly increasing rate of new information being produced
The ease of duplication and transmission of data across the Internet
An increase in the available channels of incoming information (e.g. telephone, e-mail, instant messaging, rss)
Large amounts of historical information to dig through
Contradictions and inaccuracies in available information
A low signal-to-noise ratio
A lack of a method for comparing and processing different kinds of information