Exporting the Contacts
Head to http://www.linkedin.com and login to your account.
Click on the ‘Connections’ button on your left hand menu.
Scroll down to the bottom of your LinkedIN contact list and click ‘Export Connections’.
Select ‘Microsoft Outlook (.CSV file) and choose to Export the file. Save it somewhere you will remember – it will be needed again soon!
Login to your free e-mail account and upload your connections to your contacts list via .CSV; the file we just downloaded from LinkedIN.
Importing the Contacts to Twitter
Login to Twitter.com
Click on ‘Find People’ and then ‘Find on Other Networks’.
Select the free e-mail account you setup, in this case Gmail.
Type in your e-mail account username and password (do not worry, it is safe) and press ‘Continue’.
Twitter will now discover which of your Contacts use Twitter and automatically follow them. Hopefully, they will follow you too!
for my information, check out this resource