Once you have the e-mail address list, go to the friends tab and click invite friends:

On the invite friends page, there is a box where you can copy and paste all the e-mail addresses into. Type "FarmVille Neighbors" into the e-mail address list you got from the Facebook group. Facebook will now automatically send a friend request to the e-mail addresses in the list. The bigger the list you use, the more friends you can add!
Additionally, you can add your e-mail address to the end of the list and repost it, so everyone that uses the list will add you as a friend. You can easily get hundreds of new neighbors this way.
Why would you want 100s of neighbors?
Well, you want 50 neighbors for the Local Celebrity ribbon. After that though, the more neighbors you have, the more of your crops can possibly get fertilized. A 20x20 farm has 400 possible crop squares - even if every single neighbor fertilized your crops, you would need 80 neighbors to get your entire farm fertilized once per day (and every neighbor will not help you out on a daily basis).
Additionally, if you are growing 4 hour crops (or even 2 hour crops), you literally would still benefit from adding 1,000 neighbors - that way you could get lots of free XP from people fertilizing your fields!

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