Just saw this on Mashable:
Yesterday, we fell in love with “Jenny,” a young woman who quit her job through a series of amusing whiteboard messages. Alas, this one was too good to be true. “Jenny” is really Elyse Porterfield, an aspiring actress from Glendale, California.
The prank was created by brothers John and Leo Resig for their humor site, theCHIVE.com. Peter Kafka from AllThingsD grew suspicious of the story yesterday and did some digging. Porterfield has also tweeted confirmation of her role in the stunt.
Here’s more from TheChive.com.