Tumblr is a social network of blogs that grows in number of bloggers every day. People join Tumblr to chat with friends, make acquaintances and blog about their personal interests. Finding your friends on Tumblr will allow you to connect with them on a more personal level by connecting to their posts and communicating with them on their ideas. You can find friends easily through your e-mail contacts from providers such as Gmail or Yahoo.
Click "Sign Up" at the top of the Tumblr home page. Registering will allow you to see any of your contacts or friends already signed up for Tumblr.
Enter your e-mail address, a new Tumblr password and your desired Tumblr URL. Click "Submit."
Go to your Tumblr Dashboard or your user's home page. This will display your inbox and other options you control.
Click on the "Following..." option on the right.
Click on the "People You Know" tab.
Choose either "Gmail" or "Yahoo" to allow Tumblr to search your contacts in those accounts.
Click the confirmation option to allow access to the email program's contacts.
Tumblr will search your contacts and let you know if any of your contacts also have a Tumblr account. Then it will give you the option to follow them on Tumblr.