1) have neighbors through Facebook
2) go to the shop on sims (not purple cart)
3) click on social
4) put as many as you can at your house
5) exit shop
6) click on the ... Under the shop
7) click on the bottom right lock button, account manager (blue background white lock)
8) sign out of Facebook
9) go back to store (above ...)
10) sell the social things you just added.
The higher the amount of neighbors it takes to add the social item the more money its worth. This will not affect the number of neighbors you have when you sign back into Facebook.
To get your neighbors back:
1) click on ... Under the shop
2) click on the bottom right lock again
3) sign into Facebook
Hope I helped