An option in most e-mail programs and on social media sites such as Twitter, it allows you to send duplicate copies of a message. When you type a recipient's e-mail address in the cc field, it is viewable to everyone who receives the e-mail message (as opposed to a bcc or "blind" carbon copy recipient).
Online jargon, also known as text message shorthand, used in texting, online chat, instant messaging, email, blogs, and newsgroup postings, these types of abbreviations are also referred to as chat acronyms.
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NetLingo Classification: Acronyms and Text Message