Hilton HHonors: 2,500 Bonus HHonors points for bookings over the next 24 hours (act fast limited to first 4,000)

Hilton is once again running bonus offer promotion for bookings made during a 24hr period:

This is from their Facebook page after you like them:

The Great Getaway is on. If you hear travel calling you, don’t wait to answer – book now with our 24-Hour Bonus Offer. Plan your next Great Getaway today and earn 2,500 Bonus Points.
Here's how:

1. Starting at 11:00 a.m. ET May 23 and ending on 10:59 a.m. ET May 24, book a stay between May 23 and September 30, 2013 at any hotel within the Hilton HHonors™ portfolio.
2. Return here to enter your reservation confirmation number, HHonors number, and required information. Act fast – to earn Bonus Points you have to be one of the first 4,000 Hilton HHonors™ members to book and register.
3. Complete your stay by September 30, 2013 and earn 2,500 Bonus Points.

To take advantage of the promotion you have to like Hilton HHonors on Facebook and then after you book you enter your reservation details and HHonors on their Facebook page. You can access the booking page directly here if you don't want to 'like' them on Facebook just yet to make sure you will do a booking first.