Oops, it doesn't look like 'tweeting day' is a national day..

Other days

lisp

Lisp Day
believe

Believe Day
frozen yogurt

Frozen Yogurt Day
latina equal pay

Latina Equal Pay Day
stud

Stud Day
ride the wind

Ride The Wind Day
girl friend

Girl Friend Day
nail polish

Nail Polish Day
hannah

Hannah Day
one

One Day