The Twitter ecosystem may be changing constantly, but most of that comes on the back of individual developers and outside companies. They beat on Twitter APIs to create new products that may win them glory, recognition or cash. Over the past month, though, Twitter itself has gotten into the game, releasing or announcing a handful of new features.

A new function for "retweeting" (echoing another's tweet to your own followers), changes to how trending topics are managed, and the ability to create lists are new tools intended to engage users ... on the Twitter.com website. Considered within the context of Twitter's changed terms of service this year, the upgrades may be part of a broader ad-based revenue plan.

Best Buy (NYSE: BBY) may be the world's largest electronics retailer, but it realizes that it faces a huge threat to a hefty chunk of its business. Apple (NASDAQ: AAPL) is moving plenty of movies and other soon-to-be former DVD fare through iTunes, staking a claim on a business that once belonged to Best Buy. The big box store is getting ready to fight back (finally?).

Using technology it's licensing from Sonic Solutions (NASDAQ: SNIC), Best Buy is opening an online store for movies and television shows. Best Buy CEO Brian Dunn says this move will expand the company's presence in services and will bolster company loyalty. That's the press release version, of course. The reality is that Best Buy needed to do something to protect this portion of its revenue and probably should have made the move several years ago.

Wal-Mart Stores Inc. (NYSE: WMT) has been the leader in DVD sales in the U.S. for years now. It's estimated that 40% of all U.S. DVD sales originate within the doors of the world's largest retailer. But, could those days be coming to an end?

With Blu-ray DVD players coming with built-in internet video streaming, cable and satellite having video-on-demand choices of all recent movies, and more people buying content from Apple Inc.'s (NASDAQ: AAPL) iTunes every day, what is the future of the physical DVD?

With the Apple (NASDAQ: AAPL) Tablet, newspapers doing what they should have done: thinking about the possible impact to their business and trying to find ways to mitigate it. This comes 15 years after the industry ignored the internet and a decade after it disregarded Google (NASDAQ: GOOG). Of course, unwilling to admit its salient and severe fallibility, the newspaper folks are saying that they don't want the Tablet to destroy print the way the iPod destroyed the music industry.

The newspapers are apparently worried that circulation could plunge, driving profits through the floor and jeopardizing their abilities to operate. They are concerned that properties like the New York Times Co.'s (NYSE: NYT) Boston Globe could wind up selling for a single-digit percentage of the original purchase price.

Apple Inc. (NASDAQ: AAPL) is not only making a killing with its hardware (ala iPhone), but its App Store boasts 60,000 downloadable applications and is the largest on the planet for any wireless device. But the software part of the Apple entertainment ecosystem -- iTunes -- has not had much attention in quite a while.

Here's one thing: how about 25% market share for all music -- physical and downloaded -- in the U.S.?

Nielsen ratings have always been an imperfect system of projecting who is watching what when. The advent of DVR technology and internet-streamed programming have made the television ratings game even more challenging.

So the major TV companies -- General Electric's (NYSE: GE) NBC Universal, Time Warner (NYSE: TWX), News Corp. (NYSE: NWS), Viacom (NYSE: VIA), CBS Corp. (NYSE: CBS), and Walt Disney (NYSE: DIS) -- have teamed together to fight against Nielsen, which not only delivers arguably flawed data, but charges a hefty fee to do so.

I thought I'd take a look at two companies that reported earnings earlier in the week that share a couple things in common. First, they deal with music. Second, their prospects have been defined, in part, by the surge of Apple's (NASDAQ: AAPL) iPod/iTunes zeitgeist.

Let's begin with Warner Music Group (NYSE: WMG). According to Reuters, Warner Music Group lost 25 cents per share from continuing businesses in Q3. Analysts wanted to see a loss of only 16 cents per share. In last year's Q3, the company lost 6 cents per share. Not a good trend. Warner Music Group's management unfortunately fails to impress.

Apple, Inc. (NASDAQ: AAPL) and Palm, Inc. (NASDAQ: PALM) just keep volleying with each other with the duel between the iPhone and the Palm Pre, don't they? Accusations of an
"iPhone copycat" surfaced right after the Palm Pre was announced. After all, quite a bit of Apple design influence now works at Palm. But the war is not over yet, as one of the neater features of the Palm Pre has now been deactivated by Apple.

An interesting article from the BBC takes a look at how file-sharing web sites can actually make a music act more popular. In fact, the research cited in the article shows that the most-pirated songs tend to be those at the top of the charts.

Think of the potential impact of this on Apple (NASDAQ: AAPL). I remember the halcyon days of Napster and the likes, when you could go online and find songs from various artists (I even found Scruffy the Cat on Napster, not an easy task) and download as many as you want.

Well, when the RIAA and Metallica decided to wade into the fray -- sites like Napster were either summarily shut down or had to start charging for their services.

For the first quarter, Live Nation said that revenues dipped by over 6%. Currency translations affected the top line, so if you strip them out, you get an increase of nearly 3%. The loss from continuing operations expanded by an earsplitting 40% to $1.29 per share. According to this news article, analysts were looking for a loss of only $0.82 per share.

Warner Music Group (NYSE: WMG) released its Q4 earnings on Tuesday. Did the numbers have all the makings of a hit? To start off, revenues declined over 1%. That's not hit material, to be certain. Here's something that might get your toes tapping, however: income from continuing operations came in at $0.04 per share, a pretty musical achievement considering that analysts thought that a loss of $0.02 per share would be recorded. And I have to note that the company did pretty good on the free-cash-flow front (I also noted this in a previous piece).

But here's the deal with Warner Music Group: like the music industry in general, it's still trying to adjust to the digital age. Buying music recorded on physical media just isn't where it's at these days, thanks to Apple (NASDAQ: AAPL) and others. The music industry would really love to get more money for their content, but because of the popularity of the low-pricing scheme at iTunes and other download sites, I don't think that's going to happen anytime soon. Indeed, when I purchase songs at Amazon (NASDAQ: AMZN), I really appreciate that $0.99 price point, and I probably would loathe paying $1.29, $1.39, etc., per tune.

In the end, even with the earnings beat, I'm not sure I could seriously consider Warner Music Group as a great investment idea. Forget that the company's release schedule is reportedly being affected by the recession and that this may shift potential earnings excitement to the latter part of the year -- you've got to remember that this is a low-priced stock in a difficult market environment. As of Tuesday's close, Warner Music Group was trading for less than $3 per share. The stock has been very weak lately, a falling knife, in fact. Best not to attempt a catch of this particular blade.

Disclosure: I don't own any company mentioned; positions can change at any time.