I think you are right slightly difference in spelling can reduce our traffic. Thats why I think we should use the most popular spelling for the city. But I think the official spelling Kolkata is more popular so there is very little effect of spelling on traffic. I suggest members who are adding bookmark for this site on other sites or are writing resources on this site to use both spellings in tag as this will increase traffic. Please give your opinion on this suggestion. This will help other members to write traffic attractive article and bookmark submission.
With Best Regards,
Working for an ideal and peaceful society.