If your donations was in return for buying FB tickets, 80% of the donation is deductible.
From the IRS Website:
Contributions From Which You Benefit
If you receive a benefit as a result of making a contribution to a qualified organization, you can deduct only the amount of your contribution that is more than the value of the benefit you receive. Also see Contributions From Which You Benefit under Contributions You Cannot Deduct, later.
If you pay more than fair market value to a qualified organization for merchandise, goods, or services, the amount you pay that is more than the value of the item can be a charitable contribution. For the excess amount to qualify, you must pay it with the intent to make a charitable contribution.
Example 1.
You pay $65 for a ticket to a dinner-dance at a church. All the proceeds of the function go to the church. The ticket to the dinner-dance has a fair market value of $25. When you buy your ticket, you know that its value is less than your payment. To figure the amount of your charitable contribution, you subtract the value of the benefit you receive ($25) from your total payment ($65). You can deduct $40 as a charitable contribution to the church.
Example 2.
At a fund-raising auction conducted by a charity, you pay $600 for a week's stay at a beach house. The amount you pay is no more than the fair rental value. You have not made a deductible charitable contribution.
Athletic events. If you make a payment to, or for the benefit of, a college or university and, as a result, you receive the right to buy tickets to an athletic event in the athletic stadium of the college or university, you can deduct 80% of the payment as a charitable contribution.
If any part of your payment is for tickets (rather than the right to buy tickets), that part is not deductible. In that case, subtract the price of the tickets from your payment. 80% of the remaining amount is a charitable contribution.
Example 1.
You pay $300 a year for membership in an athletic scholarship program maintained by a university (a qualified organization). The only benefit of membership is that you have the right to buy one season ticket for a seat in a designated area of the stadium at the university's home football games. You can deduct $240 (80% of $300) as a charitable contribution.
Example 2.
The facts are the same as in Example 1 except that your $300 payment included the purchase of one season ticket for the stated ticket price of $120. You must subtract the usual price of a ticket ($120) from your $300 payment. The result is $180. Your deductible charitable contribution is $144 (80% of $180).