All internet: Craigslist, ForRent and ApartmentRatings. The links on craigslist and forrent direct viewers to our website and tracking the traffic there is a direct correlation from big monster sites to our website to application. Oddly enough, we'd been thrashed on apartmentratings and the tenants who chose to read the feedback liked what they read, checked us out, rented and have been great tenants.
I used to work for a company that marketed strictly to seniors, and strictly on the internet. Their research determined that seniors who use the internet tend to have more discretionary income and a higher education level. We know that education level of course does not factor into leasing decisions but worth noting regardless.
The property I'm at now went from C to B (lets say B+) by using those tactics. Through aggressive sales (haha that would be me) we were able to bring in tenants who moved here out of choice as opposed to those who felt they had no options. Made a huge difference over a year's time. We were able to filter out those who were moving from down the street because their current landlord was giving them warnings about behavior or late rent.
I've used this formula with several properties and it has worked. It's nothing new and as everyone attests the internet is an effective marketing tool. But, those properties are all in an urban area where more people have access to this type of marketing to begin with. And as another poster stated, many of the walkins are the result of a prior internet search. It's the same concept as the retail stores. They viewer may not necessarily buy online, but they did their research online.