@Nafees, if you want Blogger Icon, then simply download 'zocial' font on your blog. It will change Capital b (B) to Blogger Icon.
On zocial font, their are many icons available that are not available in Font Awesome Icon. Like Blogger, Ubuntu. And its very easy to use. If you set font-family to zocial, and then type 'W', then will change into WordPress Icon. I think you should try it.