BANGALORE, INDIA: After registering a tremendous growth, Twitter.com is witnessing a fall in terms of the US traffic in 2009.

eMarketer, a market research and trend analysis firm, citing Nielsen, said that traffic to Twitter.com was down a dramatic 27.8 per cent between September and October 2009, falling to 18.9 million unique visitors.

Before Nielsen, a market researcher, comScore, another firm in the same genre, had said unique visitors to Twitter were down 8.1 per cent in October, while Compete, this too a market data provider, reported a 2.1 per cent decline, said eMarketer report.

There seem to be several reasons behind the recent fragile show of twitter. Crowd Science data from August 2009 indicated 43 per cent of Twitter users accessed the service through third-party applications, and 19 per cent through SMS.

While migration to other platforms, such as third-party applications and mobile access was cited a main reason, rising smartphone adoption and the popularity of mobile Twitter clients is considered a point in favor of migration.

eMarketer had estimated in September that 18 million US adults would use Twitter by the end of 2009.

Last month, Twitter CEO had admitted that the traffic growth of twitter.com has slowed temporarily in the U.S.