Floyd Mayweather Jr. defeated Miguel Cotto in a unanimous decision Saturday night to capture a piece of the 154-pound boxing title. Now that Mayweather has captured his 8th championship belt, many are hoping for a fight with Manny Pacquiao.

We used Social Radar to analyze conversations around Mayweather online.

Mayweather conversation sentiment

Conversations around Mayweather are currently 74% positive. Justin Bieber, who entered the ring carrying Mayweather’s championship belts alongside Lil Wayne and 50 cent, was a major topic of conversation.

Justin Bieber mentions within Mayweather conversations

Bieber is currently being mentioned in 16% of all Mayweather conversations. Conversations mentioning Bieber and Mayweather are 93% positive.

On May 4, Adam “MCA” Yauch, a founding member of the pioneering rap band the Beastie Boys, died after a nearly three-year battle with cancer. Fans paid tribute to MCA via Twitter and other social media sites. We used Social Radar to analyze conversations online.

Adam Yauch / MCA / Beastie Boys mentions

Adam Yauch, MCA or Beastie Boys were mentioned more than 2.1 million times online May 4.

Adam Yauch vs. Whitney Houston mentions

For pop culture perspective, we compared Adam Yauch mentions to Whitney Houston mentions — Whitney Houston’s passing in February generated 14X more chatter online.

Rest in peace to both music icons.

Music legends Dr. Dre and Snoop Dogg did the unthinkable and resurrected Tupac for an amazing performance to close out Coachella Sunday night. Although several albums have been released after Tupac’s death in 1996, including a biographical documentary that came out in 2003, this is a first for his live performances.

We used Social Radar to analyze conversations around Coachella online.

Coachella buzz

Coachella mentions more than doubled mentions in 2008, 2009, 2010 and 2011.

Coachella sentiment

Conversations around Coachella 2012 were 73% positive over the weekend. Tupac was the most mentioned artist, appearing in 35% of Coachella conversations.

Should we expect to see all of our favorite dead performers in concert as a hologram in the near future?

Nicki Minaj turned some heads with her performance full of religious symbolism at the 2012 Grammy Awards. The performance welcomed her alter ego Roman Zolanski to the Grammy stage for the first time. The Catholic Church expressed distaste for the performance, which began with a mock confessional. Catholic League president Bill Donahue blamed the Recording Academy for allowing the number to air.

We used Social Radar to analyze conversations around Nicki Minaj online.

Nicki Minaj buzz

Nicki Minaj mentions increased 1,781% following her performance at the Grammys.

Nicki Minaj conversation sentiment

Conversations around Nicki Minaj were 71% negative following her performance. Nearly every topic of conversation was negative (red).

Some say the performance saved the Grammys, catapulting the event from just another awards show into a social media spectacle. But do you think Nicki Minaj did permanent damage to her brand and her career in the process?

Chrysler’s ads for the Fiat 500 starring Jennifer Lopez have become a lightning rod for the car’s disastrous launch. The Fiat 500 was supposed to be one of Chrysler-Fiat’s big global brands, and its answer to BMW’s iconic Mini. But in the US, the Fiat 500 is off to a dismal start since launching in March. It initially expected to sell 50,000 units in the first year, but so far, it’s only at 15,000. In fact, 29 of its 130 US stores didn’t sell a single one last month. No one believes that Lopez would drive through her old ‘hood in the South Bronx in a Fiat.

Then, in a brazen product placement stunt,  Jennifer Lopez featured a Fiat at center stage of her American Music Awards performance Sunday night.

Jennifer Lopez mentions within Fiat conversations

Lopez appeared in nearly 13% of all Fiat conversations online following the American Music Awards performance.

Fiat buzz

Fiat buzz peaked in early November.

Fiat sentiment

Negative buzz spiked dramatically following the American Music Awards performance.

Did Jennifer Lopez sell out?

The boxing world was quick to react upon hearing news of the death of former heavyweight champion Joe Frazier, who passed away at age 67 Monday night after a brief bout with liver cancer.

Then Tuesday, hip-hop artist Heavy D died at age 44 after collapsing outside his condo in Beverly Hills. The music community called Heavy D “the only rapper everybody always loved.”

In today’s world of social media, fans have more outlets than ever before to express condolences to those who have passed.

Heavy D and Joe Frazier mentions

Although neither had been in the news recently, both received a huge amount of condolences online this week.

Content distribution by category

More fans paid respects to Heavy D via Twitter, while Joe Frazier received more image and blog posts.

Dr. Conrad Murray was convicted Monday of involuntary manslaughter in the June 25, 2009, death of Michael Jackson.

The Internet reacted immediately, with topics like #DoctorsBetterThanConradMurray trending on Twitter last night.

We used Social Radar to analyze conversations online.

Conrad Murray buzz

Conrad Murray mentions spiked 10X yesterday following the conviction.

Conrad Murray sentiment

Conversation topics around Dr. Murray were nearly all negative.

Propofol, the drug Dr. Murray used on Jackson, was mentioned in 44% of conversations and was 90% negative.

British band Coldplay released its fifth studio album, Mylo Xyloto, Monday, Oct. 24. The album is positioned to head straight to the top of the Billboard 200 charts next week.

Coldplay chose not to make its new album available on Spotify or any other streaming music subscription service. Fans will either need to purchase physical copies or MP3 downloads from places like Apple’s iTunes store, Microsoft’s Zune store or Amazon. The decision is more likely financially motivated as Coldplay stands to make a great deal more money by encouraging the tens of millions of consumers who have streaming music subscriptions to purchase the songs.

How has the new album release affected Coldplay’s buzz online? We used Social Radar to find out.

Coldplay buzz October 2009-present

Coldplay buzz is currently more than 3x higher than its previous high point within the last two years.

Coldplay sentiment

Conversations around Coldplay are currently 76% positive online. The new album name, Mylo Xyloto, is currently being mentioned in 6% of Coldplay conversations. Rihanna, who collaborated with Coldplay on a song for the new album, is being mentioned in 5% of all Coldplay conversations. The classic Coldplay track “Fix You” is currently mentioned in 6% of all Coldplay conversations.

Dr. Conrad Murray — the physician who was Michael Jackson’s personal physician when he died June 25, 2009, with a lethal amount of the anesthetic in his system — is now on trial for Jackson’s death. Today in court, the jury heard the security guard’s 911 call, the most damning yet against the 58-year-old physician.

How does the public feel about the trial? Is Dr. Murray guilty? We used Social Radar to gauge public sentiment around the trial.

Conrad Murray buzz

Chatter around Dr. Murray spiked to its highest point yesterday.

Conrad Murray Sentiment

Conversations around Dr. Murray have been an average of 63% negative, spiking to their highest point 80% negative today.

Does the American public think Dr. Murray is guilty?

The U.S. military is in outrage over rapper Soulja Boy’s new song “Let’s Be Real”, in which he raps “f**k the army troops.” Soulja Boy has since apologized. Is the apology too late? Has the rapper negatively affected his reputation? We used Social Radar to find out.

Soulja Boy mentions

Soulja Boy mentions shot up 400% following the incident.

Soulja Boy sentiment

Nearly all conversations around Soulja Boy mention the military incident. Sentiment around Soulja Boy is currently more than 70% negative overall.

Has Soulja Boy done permanent damage to his reputation?