I found this game on a local forum, and think it could work well on Gransnet.
Rules:
1. Player posts a long word.
2. Next player makes three words from the long word.
3. Then makes up a sentence using the three words, with preferably at least 3 letters.
4. Posts a long word for the next player.
So, let's play 
INSURGENT
gent
surge
grin
She felt a surge of happiness when her gent came through the door with his usual wide grin.
DELIRIOUSLY
What sort of family would you not want to marry into?
"Old fashioned" expressions that young people have never heard.
