use this URL:
http://www.facebook.com/username.
Because most of us log in with an email address we may not be aware of our user name.
Here is how you can locate your Facebook username:
Log in to your account, click on the arrow to the right of Home in the upper-right corner and select Account Settings.
Your public url is listed on this page in the General Account Settings section.
Twitter:
To provide a link to your public Twitter profile use this URL:
http://twitter.com/username
LinkedIn involves a few more steps after you log into your LinkedIn page.
Accessing your public profile in LinkedIn.
- Select Profile > Edit Profile.
- See Profile URL listed underneath your main profile information.
- Click on Edit to locate the Customize your public profile URL option if you want to change your URL.
You can change your LinkedIn URL.
Pinterest
To provide a link to your public Pinterest profile page use this URL:
http://www.pinterest.com/username
To find your username
Login to Pinterest.com
Select your profile in the upper-right corner and select Account Settings.
Your username and public profile are listed on this page.
To view your unique Google Profile ID number:
Sign in to your Google profile.
Click Edit profile.
Click the About tab.
Click the ‘Profile URL’ section.
To customize your profile URL:
http://profiles.google.com/unique Google profile ID
Sign in to your Google profile.
Click Edit profile.
Click the About tab.
Click the ‘Profile URL’ section.
(If you use Gmail) Select the URL with your Gmail username.
(If you don’t use Gmail) Specify a username in the text box, then click Check availability. You’ll see a message stating whether your desired username is available. Click Save when you are done.