Take note of the "new" character from last post (Person A)
Pick someone from CB (Person B)
Continue the story of what happens to those people, how that interact etc, keep it 3-5 lines long.
Wait for the next person to add the next episode and see what happens to person B and a new person.
Since it has to start somewhere, Person A Hatchy, Person B Lostling
TheHatchetman swirls the mini hatchet in his right hand, and casually walks into lostling's bank. Lostling walks out and greets him with a smile, "Can I get you a loan?". Hatchetman looks at lostling as he walks pass him, and swings his hatchet into a plant in the corner, pruning it.