Tumblr has hired a director of media to help sell the value of the platform to Hollywood studio execs looking to market their movies to the young people who have flocked to the social blogging platform over the years.

You can easily take the perspective here that not only is Yahoo, which owns Tumblr, looking to maximize their ad revenue in an important entertainment vertical but that they’re pouncing on some Facebook weakness. A story a couple weeks ago centered around how Facebook was having trouble getting movie studios and their agencies on board as advertisers for any of a number of reasons.

But there’s also the risk that they’re jumping on this a tad too late. A handful of stories in the last year have purported to show Tumblr’s popularity, particularly in the younger demographics, is starting to wane, in part because of more frequent advertising. Still, TV studios and networks have been all over Tumblr promoting their shows, so it makes sense for the social blog to go after more entertainment dollars.