FanHouse GeorgesStPierre

After a big win at UFC 101, Anderson Silva has moved up the mixed martial arts pound-for-pound rankings. But is he now the No. 1 fighter in the world? Not in my rankings, which are below.

The MMA Twitter mailbag on a Monday morning after a wild weekend in mixed martial arts is all about the pound-for-pound rankings. Is Anderson Silva back on top after his destruction of Forrest Griffin at UFC 101? How high does B.J. Penn climb after whipping Kenny Florian? And what do we do with Brian Bowles and Miguel Torres after Bowles' shocking upset at WEC 42?

Plenty of debate on the matter is below.

Our new UFC twitter mailbag features questions about UFC welterweight Jon Fitch, which UFC fighters could beat Fedor Emelianenko, and my prediction of which UFC champion will be the next to lose his belt. But we start with the brutal knockout at UFC 100.

A year ago, almost everyone considered UFC middleweight champion Anderson Silva the best pound-for-pound fighter in mixed martial arts.

What a difference a year makes. Now, hardly anyone considers Silva the best fighter in MMA -- even though the Spider is still the champ, and has gone 3-0 in the past year.

Our first MMA twitter mailbag, in which you tweet the questions and I post the answers, features discussions about UFC 100, Dana White, Fedor Emelianenko, Brock Lesnar, Bobby Lashley, the upcoming Dream 10 card, and more.

Georges St Pierre dominated Thiago Alves for 25 minutes on Saturday night at UFC 100, solidifying his spot as the No. 2 pound-for-pound fighter in mixed martial arts. But he's still not close to No. 1.

I still consider Fedor Emelianenko the best fighter in MMA, in any weight class, by a significant margin. Fedor has a tough test against Josh Barnett on August 1 at Affliction Trilogy, and maybe Barnett will shock the world and force me to reconsider my pound-for-pound rankings, but for now, as you'll see below, it's still Fedor, alone at the top.

All 22 fighters will step on the scales for the UFC 100 weigh-ins at 7PM ET on Friday, and if you can't be there in Las Vegas, you can watch the weigh-ins here at FanHouse. These weigh-ins should be particularly interesting, as UFC heavyweight champion Brock Lesnar will have to spend some time in the sauna to get down to the heavyweight limit of 265 pounds for his fight with Frank Mir, while No. 1 welterweight contender Thiago Alves sometimes has trouble getting down to 170 pounds, which he'll have to do if he wants to take champion Georges St Pierre's belt.

The video is below.

There's been so much hype around the Brock Lesnar vs. Frank Mir rivalry at UFC 100 that I feel like the welterweight title fight between Georges St Pierre and Thiago Alves may be getting overlooked. GSP and Alves have shown nothing but respect for each other, and that's not what sells fights. But Alves did his best in talking to Ray Flores in the above video.

The hype for UFC 100 hit ESPN Monday morning, but it was a fighter who's not on the card -- Randy Couture -- who appeared on ESPN Radio's Mike and Mike in the Morning to promote Saturday night's fights. Couture had some interesting comments about the welterweight title fight between Georges St Pierre and Thiago Alves.

"Georges is probably one of the most dynamic fighters that we have in the sport today," Couture said. "He's got a very interesting background from karate, and he's added a whole bunch of other skills to go with that background."

As Greg Jackson helps UFC welterweight champion Georges St Pierre prepare for his title defense at UFC 100, he says the two biggest weapons that challenger Thiago Alves can threaten St. Pierre with are his left hook and his knee.