AddThis helps brands work with social and reaches over 1.3 billion unique users a month.
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Monthly unique users according to comScore have risen to 135 million, from just 12 million in January 2009.
Some 8.5 million unique users in Britain spent time on Facebook last month, down from 8.9 million in December.
The site attracts 8 million monthly unique users, with traffic doubling since January and increasing 25% since September.
In April 2012, Facebook says it drove 1.1 billion visits from 160 million unique users to third-party mobile apps.
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Today, it has eight hundred million unique users a month, and generates more than three billion views a day.
More than 500, 000 people already have created Watchlists on TVGuide.com, which has more than 25 million monthly unique users.
Along the way, our audience has grown to 25 million monthly unique users, 50% more than a year ago.
But the report suggested WLM's US audience had fallen to 8.3 million unique users, representing a 48% drop year-on-year.
Its website, which details interruptions on lines, attracts 8m unique users a month.
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In the last year, Forbes.com traffic has nearly doubled to 29 million monthly unique users (as measured by Omniture).
According to web monitoring firm Nielsen, over a million unique users from the UK visited the three websites in September.
And as of March, it had 19.4 million unique users on its website and mobile apps, which is 90% year-over-year growth.
But given that most visitors to sites like Facebook are members, a drop in unique users could indicate a drop in activity.
With 15 million users overall, the company claims to be adding 45, 000 new unique users every day to its DocuSign Global Network.
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Facebook would not share data on "unique users, " but in an e-mail exchange with Forbes.com, said that it still sees its membership growing.
But a big decline in popularity means it now attracts some 12 million monthly unique users worldwide, compared to Facebook's 400 million members.
Eurogamer, with an audited circulation of 5 million unique users per month, plans to roll the service out to its European-language sites also.
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Unique users in France ticked down to 1.87 million from 1.89 million in December, while in Spain the number fell to 659, 000, from 682, 000.
Scanlife, a provider of QR code services, saw the number of unique users scanning codes through its system triple in the year to March.
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In March, the blogging site had about 117 million unique users world-wide, up from about 58 million a year earlier, according to comScore Inc.
And the jury is still out on whether a one-month decline in unique users will turn into a longer term erosion of the Facebook story.
Payscale put the mid-career salary data together for Forbes from the profiles of its 24 million unique users that supply compensation information on its website.
Net quickly became the largest Internet gaming network with this sole title, totaling 1.5 million unique users (separate computers) playing aver 30 million games to date.
Seven years later, the site displays more than 4.5 million real estate and rental listings nationwide, and attracts more than 22 million unique users each month.
Monthly unique users in the quarter was a bit more encouraging, growing to 146 million, up from 111 million in Q4, and 124 million a year ago.
Payscale combed through the profiles of its 30 million unique users who supply compensation information on its website to find which law school grads make the most.
Mayer says Yahoo is not breaking out mobile this quarter. 200 million monthly unique users on mobile is something you should look at - revenue will follow.
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Livescience now attracts some 1.6 million unique users per month.
Pinterest eventually took only 9 months to grow from 50, 000 to 17 million monthly unique users whereas Twitter took 22 months, Facebook 16 months, and YouTube 12 months.
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