This set of line icons is completely free to use. There are 18 icons: RSS, Email, Facebook, Twitter, Pinterest, Instagram, Google+, MySpace, LinkedIn, Forrst, Yahoo!, Spotify, YouTube, Dropbox, Delicious, StumbleUpon, Vimeo and Reddit. They are 128px x 128px.
You can download the PSD File here
If you need any icon that isn’t included in this set, please contact me and I will try to help.