Yes, but with an asterisk. Anything that is marketed effectively can work. I have had a lot of success with open houses this Spring/Summer by advertising them via Trulia, Zillow, Realtor.com and Homes.com at least a week in advance. First and foremost though, you have to be driving online buyers to your listings in the results -- how? Attractive, professional quality photos, in addition to engaging video. If your home and the way it is marketed are beautifully done, then an open house is a great way to get more people in the door all at once. My open houses used to be duds, only like 1-2 visitors and a how bunch of free time, but once I embraced these technologies and upgraded my presentation, I'm consistently averaging about 6-8 open house visitors (majority of which are qualified buyers) per open house. I've actually used an upcoming open house as leverage for why an offering buyer should bring us a full-priced offer... and it worked!!