We do prefer videos over written descriptions, as it's much easier to ascertain the impact of an idea or effect via video rather than written description, especially with the volume of submissions received. Method should be included in the submission as well so that our creative team can better assess the effect and whether or not it is something that we think fits the site.
All submissions are of course held in complete confidence and only looked at by our creative team. If a submission is of interest, or if we need further information, we'll contact you via email or phone as soon as we see it.