Jean Anthelme Brillat-Savarin (1755-1826), in the book Physiologie du Gout (1825), wrote “Tell me what you eat, and I shall tell you what you are,” often interpreted as “you are what you eat.” Twitter has made the new saying into “You are what you tweet.”
 
“You are what you tweet” has been cited in print since at least January 2009.
 
   
Wikiquote: Food
Dis-moi ce que tu manges, je te dirai ce que tu es. Tell me what you eat, and I shall tell you what you are.
. Jean Anthelme Brillat-Savarin, Physiologie du Gout (1825); tr. M. F. K. Fisher, The Physiology of Taste: Or Meditations on Transcendental Gastronomy (1949)
. Variants:
..Der Mensch ist, was er ißt. Man is what he eats.
..Ludwig Andreas Feuerbach, Die Naturwißensschaft und die Revolution [Natural science and the revolution] (1850), repeated in Das Geheimnis des Opfers, ober der Mensch ist was er ißt [The mystery of sacrifice, or man is what he eats] (1862)
..You are what you eat.
..Victor Lindlahr, You Are What You Eat: how to win and keep health with diet (1942)
 
Kommein
You Are What You Tweet
Posted on January 22, 2009 Written by Deb Ng
I recently unfollowed a couple of people from Twitter. The first I unfollowed because of spam.
 
23 May 2009, The Deseret News (Salt Lake City, UT), “Twitter Tees: Threadless launches T-shirts with sayings written by the Twitterati”:
Submissions included: “You are what you tweet,” “Full tweet ahead,” “Tweet like no one is reading,” and “Twitter: helping manage my ADHD in 140 characters or less.”
     
xcitefun.net
vicked.vicky
Posted: Feb 03, 2010
Funny Twitter Quotes
1. “Ask not what your twitter can do for you, ask what you can do for your twitter.”
-John F. Kennedy
(...)
29. “You are what you tweet”
-Dr. Victor Hugo Lindlahr
30. “I tweet, therefore I am”
-Rene Descartes
 
OCLC WorldCat record
Food and social media : you are what you tweet
Author: Signe Rousseau
Publisher: Lanham : Altamira Press/Rowman & Littlefield, ©2012.
Series: AltaMira studies in food and gastronomy. 
Edition/Format: Book : English
Summary: Social media has been a factor in the explosion of interest in food and democratization of food criticism, and this book explains and critique the phenomena and key issues in a lively and anecdotal manner that will appeal to scholars and the interested general public alike.
 
OCLC WorldCat record
In the new NHS, you are what you tweet.
Author: J McCrea
Edition/Format: Article: English
Publication: The Health service journal, 2012 Aug 9; 122(6317): 16-7
Database: From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
Other Databases: ArticleFirst
 
OCLC WorldCat record 
You are what you tweet: Personality expression and perception on Twitter
Author: Lin Qiu; Han Lin; Jonathan Ramsay; Fang Yang Affiliation: Division of Psychology, Nanyang Technological University, Singapore
Edition/Format: Article : English
Publication: Journal of Research in Personality, v46 n6 (December 2012): 710-718
Database: ScienceDirect
Other Databases: WorldCat; WorldCat; WorldCat
Summary: Microblogging services such as Twitter have become increasingly popular in recent years. However, little is known about how personality is manifested and perceived in microblogs. In this study, we measured the Big Five personality traits of 142 participants and collected their tweets over a 1-month period. Extraversion, agreeableness, openness, and neuroticism were associated with specific linguistic markers, suggesting that personality manifests in microblogs. Meanwhile, eight observers rated the participants’ personality on the basis of their tweets. Results showed that observers relied on specific linguistic cues when making judgments, and could only judge agreeableness and neuroticism accurately. This study provides new empirical evidence of personality expression in naturalistic settings, and points to the potential of utilizing social media for personality research.