Mike Bloomberg famously has given away $8 bln in charity. Less well know is how his company encourages volunteering. Part of that effort is to make it easy.

Bloomberg has a online sign up so you can browse among events ranging from helping serve breakfast at a homeless shelter, to teaching English to immigrants to painting schools. You click a button and it tells you where to go.

Last week I joined about 60 colleagues volunteering at Materials for the Arts, a charity in Long Island City that collects art materials for teachers and others.