A lot of FSBO sellers start by posting on Zillow’s “For Sale by Owner” section, Facebook Marketplace, or a dedicated FSBO listing site. Those aren’t bad tools, but on their own they leave a huge amount of buyer traffic on the table. Here’s the difference.

Where Buyers and Agents Actually Search

The MLS is the master database that real estate agents use to search for homes on behalf of their buyers. When your home isn’t on the MLS, agents working with buyers in your area may never see it — even if it would be a perfect fit. A posting on Zillow’s FSBO section only reaches people browsing Zillow directly; it doesn’t reach agent-represented buyers, and it doesn’t automatically syndicate anywhere else.

MLS Listings Syndicate Everywhere Automatically

Once your home is on the MLS, it flows out to Zillow, Realtor.com, Trulia, Homes.com, and dozens of other real estate sites within hours — through the same feed agent-listed homes use. You’re not choosing between the MLS and Zillow: an MLS listing gets you onto Zillow too, plus everywhere else, plus in front of every buyer’s agent searching in your area.

The “Buyer’s Agent” Gap

Roughly 9 out of 10 buyers work with a real estate agent. Those agents almost exclusively search the MLS, not FSBO sites. If your listing only exists on Zillow’s owner-listed section or a flat classifieds-style FSBO website, you’re invisible to the majority of active buyers in your market.

What FSBO-Only Sites Are Good For

Pure FSBO listing sites and Facebook Marketplace can still be useful as a supplement — extra exposure costs you nothing once your home is already on the MLS. The mistake is treating them as a replacement for MLS exposure instead of an add-on to it.

The Bottom Line

A flat fee MLS listing gets you the same syndication and agent visibility as a traditional agent-listed home, without the commission. FSBO-only sites get you visibility with a much smaller slice of buyers. Most sellers get the best results using both — MLS as the foundation, FSBO sites as a bonus.