A way to lie in someones face, and not be called a lier, a delayed action lie.

Electronic mail, often abbreviated to e-mail, email, or simply mail, is a store-and-forward method of writing, sending, receiving and saving messages over electronic communication systems. The term "email" (as a noun or verb) applies to the Internet email system based on the Simple Mail Transfer Protocol, to network systems based on other protocols and to various mainframe, minicomputer or intranet systems allowing users within one organization to send messages to each other in support of workgroup collaboration. Intranet systems may be based on proprietary protocols supported by a particular systems vendor, or on the same protocols used on public networks. Email is often used to deliver bulk unsolicited messages, or "spam", but filter programs exist which can automatically block, quarantine or delete some or most of these, depending on the situation.

What is used to sign up for facebook/tumblr/twitter/other social sites.

Someone sending you ecstacy through the mail

A practically useless method of worldwide communication, due to the widespread use of Instant Messaging.

Yet another way that crap from the Internet (pr0n, drugs, warez, virii etc) can be brought to you.. E-Mail also includes spam.

A means of distributing pr0n and surveys

No practical use found as yet.