While Yahoo seems near a deal to purchase Tumblr for as much as $1 billion, reports today suggest other notable players are kicking the tires on the growing blogging platform—namely, Facebook. So Adweek asked marketers this afternoon to weigh in on whether Yahoo or Facebook would make a better parent for the site. Responses were split, with slightly more of the small sample contending that Tumblr would thrive more under the stewardship of Mark Zuckerberg's digital giant. "My instinct tells me that an Instagram-led Facebook team [would] work better for the future of Tumblr ...