From Dante's presentation of Francesca and Paolo, we are encouraged to consider the place of moral responsibility in depictions of love, sex, and violence in our own day. We can certainly discuss music, television, movies, and advertising (as well as literature) in these terms. Who is more (or less) responsible and therefore accountable for unacceptable attitudes and behavior in society: the creators and vehicles of such messages, or the consumers and audiences?

This is an incredibly tricky question, and I believe there is a very multi-layered answer. Who is ultimately responsible for the consumption of sexual and violent messages from media? Is it the recipients, who choose to partake in it, or is it the industry and professionals who are promoting it?
I believe there is responsibility on both sides of the issue. The creators of this type of content certainly bear some blame for the rampant violence and sexuality in media and entertainment. From a moral perspective (depending on how one views sex and violence), peddling inappropriate content to the masses could be seen as a form of corrupting and demoralizing them. The media are participating in the spread of immoral messages, promoting them simply because they profit from them.
Therein lies the other issue: the masses have made this media profitable. People continue to consume media riddled with sex and violence for pleasure. They are responsible for a large portion of the blame, because not only are they corrupting themselves by engaging in this media, they are contributing financially to the companies that create and promote it, thereby supporting them.
In Dante's work, he laments the fate of the individuals who fell victim to their lust, such as Francesca and Paolo, but he also pities them, because they were deeply in love. This is an inherently different situation than the one at hand in the modern era. We're talking about lust being presented to the masses in modern media, not the unquenchable love and desire between two people who are restricted from being together. The media often peddles sexuality for monetary gain, and the same goes for violence. In Dante's day, there was a considerable amount of what people called "righteous violence," or fighting that was deemed necessary, though even the Knight's code of chivalry dictated that violence should be avoided if at all possible. Now, though, the media peddles violence for the sake of entertainment, and the masses devour it just as readily as sexuality.
It is for these reasons that I believe the responsibility is shared. However, the consumer is ultimately responsible for ending the machine that perpetuates these immoral presentations. In order to bring an end to rampant depictions of violence and sexuality, the consumer needs to make them no longer profitable for the companies generating the content.