As an active "tweeter", I will attest that TWTR is very efficient online method for announcing bits of information in 140 characters (or less).

Active stock traders, new organizations, celebrities (for better or worse), all the way down to pre-teens, college professors, and just about everyone else that may have a twitter.

Some make the argument that the majority of accounts are "lurkers" (similar to forum members that do not actively participate or post) and are disconnected from what it can offer.

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1982 300TDT
1991 190D
2022 Metris