Update 04/08/09: For more details on how we determine our ranking, view The new rules of branding

If sheer volume of conversation is any indication, Twitter is the hottest brand in the market. Twitter dominates a tech-heavy list of brands in our March 2009 Social Radar Top 50. The Social Radar Top 50 measures the most social brands by the number of unique topics of conversation. These brands are top of mind for consumers and bloggers today — Social Radar determined rankings according to the number of individual websites with at least one post about each brand to accurately capture the brand’s reach across the web.

The list below is based on overall conversation volume through the month of March 2009, including blog posts, news feeds, forums, social networks and Twitter posts. The +/- number represents the ranking change since February 2009.

For the full March 2009 list, download the PDF. Be sure to visit our Social Radar Top 50 page for access to each month’s results.

Questions? Comments? Tweet me: @adamcoomes

There’s the iPhone…and then there’s everything else. iPhone generates more than twice as much chatter as the next highest competitor, dwarfing BlackBerry, Palm and Nokia. Interestingly, Nokia sells hundreds of different phone models; Samsung sells TVs, desktop monitors, etc. — doesn’t matter, iPhone still dominates web chatter.

Lambert is trending down, and Anoop is on the rise this week. Adam Lambert still led in overall posts thanks to lingering buzz from his last performance, but after this week’s performance Anoop has been generating the most chatter over the past few days.

Here are the overall rankings based on number of blog posts, news feeds, chat rooms, forums, social networks and Twitter posts throughout the past week:

1. Adam Lambert
2. Anoop Desai
3. Kris Allen
4. Danny Gokey
5. Matt Giraud
6. Lil Rounds
7. Allison Iraheta
8. Scott MacIntyre

The official Skype iPhone/iPod Touch app was finally launched on the App Store just a couple days ago. It was a hot topic all over the web, as it not only provides Skype users the ability to contact each other from anywhere, but it also serves as its own telephone service, even on the iPod Touch, allowing users to bypass their carrier and make low-cost local and international calls. It’s no surprise that this generated a lot of buzz. Let’s analyze.

Below, we’ve included a conversation analysis of iPhone and iPod Touch conversations between March 29th and April 1st. We can see that Skype is one of the most mentioned keywords in all of these conversations.