According to Sarah Perez of ReadWriteWeb a study of over 16,000 mobile YouTube users conducted by Google, 75% of respondents said that mobile is their primary way of accessing YouTube.

The survey found that 70% of the respondents reported visiting YouTube Mobile at least once per day and, while there, 58% spent more than 20 minutes per visit. 38% even when as far as to report that they feel like YouTube Mobile is replacing their desktop video usage entirely.