According to a recent study at least:
Frequencies of violent acts and the context of violence (e.g., characteristics of perpetrator and victim, justification, consequences) were compared both between these categories of YouTube videos and with existing research on television violence. The results showed far less violence as a percentage of programming on YouTube than there is on television. Moreover, the violence that was present showed more realistic consequences and more negative context than television violence.
Eric Horowitz claps:
The good news is that the long-run trend is toward less television and more Youtube-ish videos. If kids are in fact getting brainwashed by what they see on TV, the future should be one in which people are more fearful of violence.