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With the caveat that it doesn’t cover third party applications, comScore puts visits to Twitter at 75 million – and regardless of the correlation between those numbers and the actual figures, what you can take away is that the graph is still going up and to the right:

It certainly seems anecdotally as if I’m witnessing more colleagues and friends not only using Twitter, but attempting to use it in a fairly sustainable way rather than registering, looking confused and then vanishing again.

Meanwhile the amount of content being produced has also risen – to a whopping 1.2 billion tweets per month according to data collected by Royal Pingdom.

The methodology used to collect the figures was pretty simple:

‘we tracked down a tweet from the first couple of minutes of each month. Using the sequence numbers of these tweets, we could then calculate the number of tweets for each month. Since finding old tweets is more or less impossible with Twitter’s own search engine, we used Google, then verified the tweet time stamp by looking at the tweet itself’

Again, while there could be some debate about the accuracy of the actual figures involved, what’s important is that the overall effect is some consistent and sizeable growth. And that’s in the face of the redesign of Facebook – the next challenger on the list is GoogleBuzz, but so far I’ve found it rather unsatisfactory, even apart from the initial privacy issues.

Although comScore only measures visits to Twitter.com, and more than half of Twitter users use clients and apps, it does provide a clue to Twitter’s growth rates.

In June it gained around 7 million new visitors, hitting 44.5 million unique global visitors, up 19 per cent from May 2009, and now making it the 52nd biggest site in the world (and with a 55 per cent international audience).

Techcrunch points to the Iran election as a contributor to the growth, while Mark Evans over at Twitterati somewhat confusingly uses comScore and Compete figures to calculate a 50-50 U.S and International split.

For the record, the biggest properties measured by comScore are Google sites, Microsoft sites, Yahoo sites, Facebook and Wikimedia Foundation sites.