n. A person who shares too much online, particularly personal information.
2011
Dan, I was thinking "The Wine Diarrheaist", unless that impinges upon Mike’s intellectual property rights.
2010
Rock music's most prolific social media diarrheaist apparently failed at her last attempt to verify @CourtneyLoveUK.
2004 (earliest)
These are the folks who have never heard the expression "brevity is the soul of wit!" Every e-mail is a mini-novel, a life story, or government report on farm subsidies.
A blog named Diarrheaist News ("Bringing you the most revolting, self-indulgent bits of the online community for your self-indulgent pleasure") had a brief and, until now, unmemorable stint back in July 2002.