A user of the Twitter social media service who is from New Zealand. New Zealanders are affectionately known as "Kiwis" (named for a flightless bird native to New Zealand, not the kiwi fruit), so Twitter + Kiwi = "Twiwi."

Wikipedia Kiwi page:

Jim from Auckland and Susan from Christchurch met other Twiwis from both the North and South islands at the all-New Zealand Tweetup.
by Michael J. Russell February 16, 2009

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