Tumblr Inc., a New York-based Web 2.0 startup, has raised $750,000 in Series A funding from Spark Capital and Union Square Ventures, according to a regulatory filing. Bijan Sabet of Spark has joined the company's board of directors. Tumblr describes its technology as enabling online scrapbooks, as opposed to online journals (i.e., blogs). It says: “Blogs are great, but they can be a lot of work. And they're really built to handle longer-form text posts. Tumblelogs, on the other hand, let you easily and quickly post and share anything you find or create.” www.tumblr.com