Is Twitter Traffic Falling?

More than one recent study has suggested that Twitter traffic is declining, after leveling off in the summer of 2009. But is it really? The answer is complicated.

According to Nielsen, traffic to Twitter.com was down a dramatic 27.8 percent between September and October 2009, falling to 18.9 million unique visitors.

Research firm comScore also noted that unique visitors were down 8.1 percent in October, while Compete reported a 2.1 percent decline.

Some might suggest the traffic decline is caused by falling interest in Twitter, while others suggest the traffic simply is caused by Twitter third-party applications and mobile access.

Crowd Science, for example, in August studied traffic patterns and found 43 percent of Twitter users accessed the service through third-party applications, and 19 percent using text messaging.

Personally, I'd bet on the use of third party apps and mobility as the explanation. Nielsen says the third quarter of 2009 was the first quarter in which more than half of mobile Internet users were accessing the Web using a smartphone, and since social network updates are a huge driver of smartphone usage, it stands to reason that traffic sources are changing.