Good one! Before I even consider today's equivalent, let me bring your attention to a flaneuresque Philadelphian of the first order who explored 1918 in real time: Christopher Morley. His collection of essays published in 1920, which is available online here does not contain even one use of the word "flaneur," but it does have "stroll" eight times and "walk" 18 times.

Be sure to check out his meander through "Little Italy."