Manually add emails and invite your friends | Invite your Yahoo Messenger
Invite Friends from Your Address Book
It's really easy to invite your friends to Company Name Sucks.

You can import your contact list from your Yahoo, Gmail, AOL, Hotmail, Lycos or Mail.com.

Just fill in your login information, click 'Import Contacts' and your contacts will appear.
Company Name Sucks WILL NOT store your information.
 
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After importing the contacts you will be asked to select them before sending the email. The emails are sent in next step.