In recent years, the ability to easily bookmark or share content on popular social media platforms has become an essential part of websites. It is also significant that this feature should be noticed by website visitors. Social media has become an imperative part of integrated marketing communications. Bookmarking by of visitors increases inbound links to your site. So it is a great idea to use icons when linking to social media sites. Icons get noticed easily and the logos are immediately recognizable. Hence, we have collected some best social media icons out here. 
Social Media Icons All In One Place
Set of Social Icons
Social Media Mini Iconpack
Handycons
Dellifeed: A Free Icon Set
Heart: A Free Social Icon Set
The Leaves Fall: A Social Icon Set For Bloggers
Social Bookmark Iconset
Set of Social Icons No.2
Social Icons Hand Drawn
6 Free New Social Icons
Free Twitter Bird Icon Set
Free Hand Drawn Doodle Icon Set for Bloggers
Cute Tweeters Icon Set
Socialize Icons
Social Bookmark Iconset: Part II
34 Social Media Icons
Social Media Icons Pack
Circle Social Bookmark Icons
Web 2.0rigami
Web 2 Icons
Social Icons Made of Wood