I used to play this one on Gaia!

Player 1 - POSTS A TABOO LETTER
Player 2 - POSTS A WORD WITHOUT THE TABOO LETTER, -and- A NEW LETTER
Player 3 - POSTS A WORD WITHOUT THE TABOO LETTER, -and- A NEW LETTER
And so on and so forth.

Let's start wiiiith:
TABOO LETTER = L

Silly, D

Exhaustion, I

partner, L

Swift, W

tooth, O

freckle, P

Alimony , E 

dragon, R

mongoose, S

twitter, E

Yarn, a

Horse, O

kitten, R

myself, t

frogs, E

living, s

blueberry, b

CARDS, A

opposum, M

TIRED, D