News of Apple’s dominance in mobile shopping and the possible waning of price comparison websites struck bloggers interest last week.

A set of moving photographs that helped define the year 2011 generated major attention in the blogosphere (and also helped BuzzFeed have its busiest day of online traffic ever). Teen singers dominated the conversation on Twitter and a Mexican presidential candidate’s gaffe was the most popular news video on YouTube.

An incident involving a woman attacking fellow shoppers with pepper spray during a Black Friday sale got the attention of bloggers last week.

Bloggers focused heavily on harassment allegations against a prominent presidential candidate and the abrupt conclusion of a celebrity marriage last week. On Twitter, pop stars led the agenda.

The GOP presidential hopefuls were a major topic for bloggers and Twitter users last week as two other subjects also generated significant interest in both social media platforms—the Occupy Wall Street protests and the life and legacy of Steve Jobs.

For the first time since the Occupy Wall Street protests began in September, the subject was among the most discussed on blogs.

The Netflix decision to drop earlier plans to split its services was seen as a victory for the power of social media last week. The iPhone 4S continued to be a hot topic on both blogs and Twitter. And a bloody goring at a bullfight was the most popular YouTube video.

The recently announced iPhone 4S triggered huge anticipation online last week, with many tech bloggers expecting an iPhone 5 instead. Changes to social networks Facebook and Google+ also fueled the online conversation. And the protests on Wall Street were among the top subjects on YouTube and Twitter.

In social media last week, it was new tech entrants versus familiar tech services—and both bloggers and Twitterers gave much better marks to the new entrants. The iPhone and Google+ received praise while changes to Facebook and Netflix were roundly criticized. And on YouTube, millions viewed a tragic crash at an air show.

The 10-year anniversary of the terrorist attacks on the World Trade Center and Pentagon was a prominent topic on blogs, Twitter and YouTube last week. Bloggers and Tweeters also engaged in some serious speculation about the upcoming edition of the iPhone.