PicasaUploaderDesktop 1.2 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. You can install this free application on Mac OS X 10.4.9 or later. This free software for Mac OS X is a product of Picasa Uploader. The program lies within Design & Photo Tools, more precisely Viewers & Editors. The most popular versions among the program users are 0.7 and 0.3.
From the developer:
Upload photos to Facebook faster than ever! This simple tool sends your photos directly from Picasa, saving you time and effort. With the Picasa Uploader, you never need to search around your entire computer to find pictures to upload. Just select the photos you want in Picasa and click the button! The uploader resizes your photos to the exact dimensions Facebook accepts, maximizing quality while keeping upload times short.
You may want to check out more Mac applications, such as Ashampoo Cover Studio 2 for Mac, ImageBuddy or Panoweaver, which might be similar to PicasaUploaderDesktop.