Colleges are experimenting with retargeted advertising, where a user's browser is tagged after visiting a college's website. This allows ads for that college to follow the user across unrelated websites. Creighton University worked with a marketing firm to retarget potential students on sites like YouTube and SparkNotes. A Catholic college group also piloted retargeting to promote member schools. While the impact is hard to measure, some colleges see it as a cheap way to raise their brand awareness online before the strategy becomes more widespread.