Fast way to reach 5000 friends with new fb account?

I figured it would be a smart choice to use some FB accounts to invite all friends to groups that I've created.
It would make the groups more targeted in terms of demography and have full control over the administration of open groups.

For instance, 5 accounts with 4500+ friends invite to one group means 22000+ members in just a couple minutes.

However, I find it a bit complicated to quickly load up an account with 5000 real friends (USA, UK, Canada targeted) with out using sexy girls profile pictures. In fact, most female users wont be interested in these accounts and are probably just removing the friend request or even worse reporting the accounts.

Are there any quick ways (blackhat or whitehat) to gain up to 5000 friends in a short period of time?

Adding Games. Pages on facebook where people comment something and add whoever likes those comments. The method is good, and active one, because these guys and girls want to be facebook famous, and you could request the page admin to make all the people add you. I have a list of such facebook pages.

Thank you for your input.

Usually, I would target members of specific groups -- since they are likely to relate or interested in groups' contents.
I was wondering if there are any faster ways like extracting the group members and using a tool to send them all friend request at once or automated.

For instance: FB used to have a page at /invite.php where you could upload up to 5 email list per day and invite all friends at once. Somehow, they removed the page couple months ago.

There is a tool, all right. Massplanner it is called. Pretty famous in BHW. Search around for it here.

I have read about Massplanner but never really thought about using it since it has so much more features focusing about scheduling and group sharing, not necessarily about adding mass friends.

Nevertheless, I'll look into it and possibly give it a try this weekend.

Bless up for the info.