I guess no one has shown the image that appears. So just to show that the system seems to be working very well, avoiding double spending and Merits inflation. 
Tks theymos.
You are a nice case study for the improvements made by theymos weeks ago.Tks theymos.
After the improvements, meriters can not send their sMerits to the same posts with same amount of sMerits when they double click in the duration of 60 seconds.
Alright, you now can't merit the same post with the same amount within 60 seconds.