I have never found a native way to do it in aperture. At the moment I create a tweet via the twitter app and then drag and drop it in to the new tweet.

Everytime you go and try and use the one from the notification centre it disappears when you try and drag a photo in.

There is a plugin you can purchase to do this if you wish, I have never used it, but if you would like to look in to it http://www.bluecrowbar.com/twitexport/

Shame Aperture can’t do this natively, but I paid the $4 for the BlueCrowbar plugin and it works very well. It does’t integrate to the ‘Share’ pull down menu - to tweet a photo, you have go via the Export menu (File/ Export/ TwitExport…) which brings up a Twitter style menu for your tweet. The good thing is that it offers you all your file size export options (including any custom sizes/ watermarks etc). If you were going to tweet lots of pictures, you’d probably create a shortcut.

Does what I need pretty well, and at $4, it’s an affordable interim option until this feature materialises in a future version … hope this helps …

Yes BlueCrowbar is good and all other comments are spot on.
@davidbmoore = twitter