Twitter co-founder Biz Stone told reporters in Mexico City this week that the companmy expects to add revenue generating features to the microblogging site in the fourth quarter, according to a report from Bloomberg.com.

After a year or more of speculation by bloggers and financial pundits on ways that Twitter could generate revenue, Stone on Tuesday said the company is building an 'analytics dashboard' designed to help businesses keep track of what is being tweeted about them.

The dashboard is expected to be ready by the end of the year