Please note: see new and updated article Yahoo now tags all contacts that have been imported from Facebook, making it difficult to migrate your Facebook friends' information. I wrote a new article that describes a new way to transfer your contacts from Facebook to Twitter using a special bookmarklet. See the new article on Facebook-Twitter migration twitter facebook google(UPDATE - It looks like Yahoo has made it difficult to export Facebook contacts, see below)So you've built great contacts and friends on Facebook, but want to follow them on Twitter, Google+ and LinkedIn? Unfortunately.
It depends on each friend's privacy settings. Each friend will have different privacy settings and not all friends will share their email address. This only works for Facebook friends who already use Twitter. OK, that's obvious, but the friend must already be on Twitter for you to follow them! For those who are not yet on Twitter, you will have the possibility to invite them to Twitter. It's not quite the same with Google+ as they don't need to be a registered member.