At first,the number of people on em

At first,the number of people on email was small,but by the end of the 20th century,there were 263 million email boxes. In the 21st century, that figure hes grown to over 2 billion, and the functions of email services in the future will become more and more diversified. And text messaging on cell phones is also increasing,so people can, in effect, be in constant touch with people who are long distances away.