Pointless comment

There is a tendency for some posters to add a 'comment'  of "+1" on some threads.

This seems to me to add little or nothing to the thread. 

If these people cannot think of anything to say for themselves, then surely they shouldn't clutter up the thread with these "non comments".

Please could the mods remove all such comments in future, in the same way that they remove other comments (and, indeed, whole threads)?