In an aggressive move aimed chiefly at improving user experience, the popular microblogging site Twitter is tightening the rules for all the third-party client applications which duplicate the official apps offered by the service itself. Talking about the move in a recent post, Twitter Platform Director Ryan Sarver advised third-party app developers that they should not even think about building client apps that have been designed to emulate the service’s official apps or reproduce the Twitter experience.

In the notably lengthy Friday post, Sarver said that, on the basis of research, it has been found that consumers continue to be perplexed by the “different ways a fractured landscape of third-party Twitter clients displays tweets and let users interact with core Twitter functions.”

Noting that Twitter needs “to move to a less fragmented world, where every user can experience Twitter in a consistent way,” Sarver clearly dissuaded the app developers from building impressionist apps.

Sarver also cited some Twitter apps in “key areas where ecosystem developers are thriving”, including data tools like Gnip and Klout; publishing tools like SocialFlow, Social CRM, enterprise clients; and “brand insights” like HootSuite, Seesmic, CoTweet, Radian6, and Crimson Hexagon.

Sarver revealed that Twitter has already had talks with leading client applications in the Twitter ecosystem about the need for consistency in Twitter’s user experience and adherence to the site’s Terms of Service; and added that the company will continue to ensure that a high bar is always maintained.