Picasa Uploader is a free software that lets you upload photos to Facebook from Picasa desktop. Picasa Facebook Uploader installs as a plugin for Picasa.
Picasa already comes with many interesting features such as Geotagging, and Face recognition. Picasa Facebook Uploader is a nice interesting addition to its features.
To install Picasa Facebook Uploader, make sure you already have Picasa Desktop installed on your computer. After that, just go to website of Picasa Facebook Uploader, and click the install button. This will install Picasa Uploader to your Picasa Desktop.
After that, you can directly upload photos to your Facebook account from within Picasa. When you click on Facebook button in Picasa, it will ask you to authenticate your Facebook account.
After that, you can upload photos to an existing Facebook album, or create a new album in Facebook, and upload photos to that.