The two methods can be combined: When you read something you agree with, try to come up with a counterargument, if you can’t refute the counterargument, post it, if you can, then post both the counterargument and its refutation.
The two methods can be combined: When you read something you agree with, try to come up with a counterargument, if you can’t refute the counterargument, post it, if you can, then post both the counterargument and its refutation.