Giving Tuesday is all about giving back to charity. I have charities that I give to each month through credit card donation. That way I get a cash back reward and also a tax deduction for the year. I research my charities thoroughly before giving and then make long-term donations.
A great place to vet charities is charitynavigator.org. What are you most passionate about? Where can you make the most difference? Some of mine are St Jude's Children cancer research hospital in Memphis, Smile Train, and Michael J Fox for Parkinson's disease. All or a large percentage of my donations goes actually helping the people, not advertising or paying director's salaries.
Giving back can be way more fulfilling than spending money on a bunch of crap that you don't need.