Normally when you select the Share feature on Facebook, the default place it shares to is your timeline. That means only those that visit your timeline will see that share.
You can post your shared topic directly onto a friend’s timeline like this:
Click the Share link and select Share on a Friend’s Timeline
In the Friend: text box, type @ and begin typing your friend’s name. When Facebook finds your friend’s name, click it and then click Post.
Your item appears on your friend’s timeline where they are much more likely to see it!