Some scanners take advantage of people's generosity at this time of year.
Beware of unfamiliar charities trying to demand that you give on the spot. Also be cautious of people calling with emotional appeals, trying to tug at the heartstrings.
Finally, the Better Business Bureau encourages consumers to research charities before giving. The BBB set up give.org to help with that.
Check out the charity's ratings with groups like the BBB Wise Giving Alliance, Charity Navigator, Charity Watch and Guidestar.
See more of the BBB's tips about giving responsibly on give.org.