It is a confusing question. Since you are a Realtor, I assume this is to generate a conversation among the Trulia users?
To answer the first question, this may or may not be MLS listed listings, but I would presume most are because they can only be submitted by Realtors. However, that's with the exception of the ones fed in by Realty Trac - those are questionable preforeclosure, NOD, REO , etc. properties.
To answer another not mentioned question - Trulia Voice Board is for Home Buyers and Sellers to ask questions and for others (mostly Realtors, mortgage brokers, and other home buyers sellers, etc) to answer those questions.
I think your question is confusing because it does not fit into Trulia Voice pattern and the spirit of Trulia..