Hi Ferjani,
Thanks for adding me to a circle on Google+. I work at Google on the Connected Sites team. We build tools that help your friends find you. There are a number of things you can do to help:
Be sure to add your other accounts on the web to your profile!
2) Click on "Edit Profile"
3) Click on "Other Profiles"
4) Add links!
If you have a Hotmail or Yahoo account don't forget to import your contacts here:
Also consider visiting the Connected Accounts settings page where you can connect your various accounts:
Thanks again for using Google+!
Paul