Apple has launched @AppStore, a new Twitter account for its popular iOS and Mac App Store.

The new @AppStore Twitter account only made its debut a few hours ago, but it has already amassed more than 35,000 Twitter followers as of this writing. For comparison, its sister account, @iTunesMusic, has more than 680,000 followers.

As the accounts first tweet explains, @AppStore will feature new apps in Apple’s iOS and Mac App Stores and provide exclusive offers for Twitter users. For example, the account’s second tweet provided a quick pitch and a link to Nike’s Training Club app.

Creating a Twitter account for the App Store seems like a simple and effective way to generate more buzz and more downloads about featured apps. It’s essentially the same thing Apple has been doing with its App Store Facebook Page, which has nearly 1 million fans. Apple also has five popular iTunes Twitter accounts tweeting about new films, music and TV shows.

Still, Apple is known for its lack of engagement in social media. The company doesn’t have official Facebook or Twitter accounts. While the @AppStore account is a refreshing addition to Apple’s social media roster, don’t expect Steve Jobs, Tim Cook or Apple, Inc. to be tweeting anytime soon.

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Evernote’s multi-platform note-taking service really took off in 2010, but 2011 is shaping up to be the startup’s biggest year yet, especially given the big boost it just got after debuting in Apple’s Mac App Store last week.

Evernote CEO and founder Phil Libin tells Mashable that because of the new marketplace, Mac has outstripped Android and iPhone as the biggest platform for new user acquisition.

The Evernote team hurried to ready an app store compatible version of its Mac app in time for the store’s launch, an effort that has paid off nicely in downloads and new users. On day one, Mac registrations were up 1800% over a normal day, resulting in 40,000 new Mac users and 90,000 total downloads.

Compare the 40,000 figure with Evernote’s 30,000 average daily new users metric (across all platforms) — remarkable on its own — and it highlights just how instrumental the store was in bringing new users. Evernote was previously adding very few Mac app users per day, Libin says. Now Mac is the biggest driver of new growth.

Libin estimates that for the first full week post-Mac App Store launch, Evernote saw 300,000 total Mac app downloads. Roughly 50% of these downloads came from users who had never previously registered for an Evernote account.

The popularity of the Mac app is also contributing to an uplight in downloads of Evernote’s other apps, according to Libin. Users are now discovering the note-taking service on Mac and learning that they can use it on other platforms as well, he says.

Libin recognizes that these early numbers are likely not sustainable, but he does believe the Mac App Store will help the startup hit the 10 million member milestone — it hit six million before the end of 2010 — sooner than originally anticipated.

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