Penn State recently published  the results from a study which classifies web searchers.  They say that people mainly use web search engines for three main purposes, thus searchers are divided into three different categories. The three main categories are:

These days, many of us have multiple places where we store contact information. For myself, I have a list of contacts in my personal email account, my work email account, contacts within some of the social networks I belong to, and then a master list on my computer. With all of the different places where we have lists of contacts, it can get a bit confusing and hard to manage.