For those of you who use the official Twitter mobile app on either your iPhone or your Android smartphone, it’s update time. Both platforms are seeing and “new and improved” Twitter app, although, the changes are a bit cosmetic; at least for the iOS environment.

Over at the Twitter blog, the changes are detailed, and for Android users, there isn’t much in the way of new features, save for the fact you can now run the official Twitter app on Android devices that are running the Ice Cream Sandwich version of their smartphone OS.

The official Twitter app, thanks to the update, now supports the Kindle Fire. In two days (2/23), the official Twitter app will be available for Barnes and Noble’s family of NOOK tablets, which means you’re going to be able to tweet (officially) from pretty much any device you have. While the iOS environment received the majority of the updated apps additions, both mobile operating systems will see new features, including:

Swipe shortcut: Swipe a Tweet in your home timeline to reply to, retweet, favorite or share it, or view the Twitter user’s profile, without leaving your timeline.

“Find friends”: We’ve added a confirmation alert when you select “Find friends”. This notification more clearly and explicitly messages the fact that when you upload your contacts’ email addresses and phone numbers, you can quickly find which of your friends are on Twitter (that is, if they’ve chosen to be discoverable by email or phone number).

The update also includes some new features specifically for iOS devices:

Copy and paste: We’ve returned the ability to copy and paste the text of Tweets and user profiles. Just press and hold to copy.

Link love: The “share” feature used to just give you the option to copy or email a link to a Tweet. Now, if there’s a link within a Tweet, you’ll see the option to tweet, copy or mail that link, or you can choose to read it later. (Select a “Read Later Service” under Settings > Advanced.)

Pressing and holding links provides similar options, along with the ability to open the link in Safari.

Direct messages: We updated the design for Direct Messages and returned the ability to mark all DMs as read. Simply tap the check mark in the lower right corner.

Font size settings: Change the font size under Settings > Advanced.

Aside from the NOOK, the updated official Twitter app is live and ready to be installed for those of you who are interested. Android devices here; iOS here; and the Kindle Fire here.