The case has ignited a debate about freedom of speech.

The two stories ignited a debate on tax avoidance.

This week she ignited a debate about the north-south divide when she tweeted that houses in the north are generally cleaner than those in the south.

This ignited a debate among netizens whether her actions were justified or unprofessional.

It ignited a debate in the press concerning the ability of the available technology to put out fires in high-rise buildings.