Luis Suarez of I.B.M., With the help of social networking tools, he has cut down sharply on his daily e-mail. "I stopped using e-mail most of the time. I quickly realized that the more messages you answer, the more messages you generate in return. It becomes a vicious cycle. By trying hard to stop the cycle, I cut the number of e-mails that I receive by 80 percent in a single week."