actually,you don't need to do this yourself,it's kind of dangerous and you may get banned for adding more friends for several days.you can find some sites to do this for you,we can also do this,here is our sites: fullsocialfans.com,we also offer boosting Facebook fan,Twitter followers,Youtube video views,and Google+1 Votes Thank you
Don't fall the pitfalls of automated services. Mingling and being social is the important thing on a site like Facebook
Put genuine looking profile picture in your facebook account...Don't do it in rapid manner .Do regular updates ,comments, chats and interact with the people.This way help you out in getting in more freind requests................
Go to groups of Mafia Wars or Farmville users. Post there that you want people to add you and that you're a daily player. Watch as the friend requests roll in. These are low-quality friends, though.
Inviting/requesting many people via Email Id will not be the effective way as normal requesting because the requests which you have sent via email will be delivered to their email inbox (they have to click on the link or button which is placed in the email which they have received, to become your friend).
Some of these ideas sound promising, but I don't know what good 5000 friends will do you if none of them are targeted toward your market.
Send PM to others to add you as a friend or tell your friends to suggest you to others. That will help to avoid ban.
friends if you have good followers on twitter, you can share your link on twitter, also you can add your Facebook profile link to twitter's Profile, I sure its help you to increase your friends
I think that sending invitations to people on various FB games and applications which require friends to get benefits is a good idea. They are likely to accept an invitation from a stranger just to get some bonuses.