Fresh from the Prezi blog:
Signing up for the free Public Prezi account has become even easier. Now you can sign up with your Facebook account, and start to create your first prezi immediately.
Embed prezis to your Facebook wall
Sharing nice prezis from our public library, or put your latest work to the test in your Facebook community became more effective as well. Paste the link of any public prezi as a status update to our official Facebook page. Your link will be converted to an embedded prezi that can be clicked through or set to full screen straight from Facebook. It works just like YouTube video embeds.
Please note: if you already have a Prezi account, you cannot log in using your Facebook account.