/ Publix Supermarkets sent two cease-and-desist letters to the founder of a Twitter account focused on when the store's popular subs are on sale. The letters focus on two side companies stemming from the account. The Twitter account had been silent since March 11 after a second cease-and-desist letter was sent. It showed signs of renewed life after news reports and expressions of public support. The founder of a disputed but popular Twitter account that alerts people when Publix chicken-tender subs are on sale says he will keep posting updates – and keep his fingers crossed that the grocery chain giant doesn't sue him, as it threatened.