Here's an example of a lively and engaging tweet about a charity:

"Join me in supporting [Charity] and make a difference in the lives of those who need it most. Every donation, no matter how small, can help bring hope and joy to those facing tough times. Let's spread kindness and generosity today!"

This tweet is a compelling call to action that effectively communicates the importance and impact of supporting a charitable cause. It encourages others to join in and make a difference while spreading positivity and kindness.