The numbers quoted below seem about right for campaigns which I've run (I'd add that the most abysmal CTR I've seen was 10k:1 for a banner ad on a site which ran multiple banner ads - it ran for three months, had millions of views, and resulted in three conversions, all of which canceled within their first month).


  
  Low conversion rate 1:500. 
  Ordinary 1:100
  Good 1:5 
  Unbelievable 1:1
  
  
  
  
  
  Low CTR: 0.5%
  Ordinary: 2.5%
  Good: 10%
  Outstanding: 60%
  


Source: What is the typical CTR and conversion ranges?

What is a good click through rate (CTR)
I have 25 object files which are combined to form one shared library. I have generated the shared library with gcc and while I was looking for exposed symbols with nm -D libmylib.so, I found two undesirable exposed symbols with the name of i and y which are in .bss section. I have tried to find them in my source files but i cant find them so if anyone can tell me whether there is some way to find that which .o file exactly has these undesired exposed symbols? Can I do it with nm or do I need another tool?

Any help would be appreciated.
