As others have already said, Trulia doesn't accept FSBO listings at this time. However if you are representing a FSBO as a flat-fee agent, you can submit the home and open house information to Trulia via the link below.
Though some have suggested that you blog about the open house, please keep in mind that our Community Guidelines prohibit advertising within our Advice section. We recommend, that if anyone wished to publicize a listing within a blog post, that they be sure to do so in the context of an informative article about the home location or the buying or selling process.
Please let us know if you have any other questions.