For those of you who are "limited" to 70 requests every 24 hours...and hopefully to help sld a bit too:
When you request materials or send free gifts (materials, hints, energy) try sending them out in groups of about 20 to 25. NEVER request materials that you can send, most neighbors are starting to "return the favor" so don't waste your requests on those, send them as gifts.
After you do a few groups of requests/gifts and the box pops up saying you can't send anymore (don't be surprised if you click on 20 and it only sends to 5 or 10, it takes some off for "70 per 24 hour limit") wait a little while...maybe 30 to 45 mins and try it again...in small groups. I do that all day long and 8 times out of 10 they get sent. I refresh my game a lot too, I think that helps with sending more than 70 and it DEFINITELY helps after you use materials for an upgrade and want to refill your inventory.
Also remember that Invites count toward your "limit", so if you get a new fb friend that wants to be your neighbor, invite them before you send out your gifts and requests or you'll have to wait until you can send more. I try to do my invites as soon as I accept the fb request.
Goos = The Goo Goo Dolls...Guns = Guns N' Roses...Me = Lisa