Webdesign.fm just released this Happy Birds free Twitter icon set.  Four cartoon style twitter icons  can be used on your blog or website to encourage others to share your content or to follow you on Twitter.

Download: Happy Birds Free Twitter Icons

These icons are available in PSD and PNG formats.

This snowball icon pack was released by iconblock on January.  I was surprised not many people know about it.  This pack contains 102 random web, internet, and toolbar icons that can be used for a variety of different purposes.

Download: Snowball Web Icons

This social media iconset is unlike other fancy social icons, contains 16 very simple popular social media icons.  They are suitable for web projects.

Designed by: masterfidgeter.com
Download: Dead Simple Social Media Icons

80 web icons can be used for general web applications such as blog themes, forums, and eCommerce sites. The icons are available in 5 different sizes (16×16px, 24×24px, 32×32px, 48×48px and 128×128px) and come as Windows ICO and 32-bit transparent PNG files.

Designed by: doublejdesign
Download: 20 Free Blockie Icons

There are a total of 10 social networks in this download. These include popular networks like Digg, StumbleUpon, Flickr, Reddit, Facebook, Youtube, and others! When you download the pack, you will receive two files - a PSD and a transparent PNG. The PNG file contains the icons in 4 different sizes to make it easier for you to use in your designs.

Designed by: FTL
Download: FTL Social Icon Pack