Social pinboard site Pinterest is now bigger than Tumblr in the US in terms of web traffic, with a number of data sources showing that Pinterest's huge growth at the beginning of the year has bumped it past the blogging site. Analysing sources such as Alexa and comScore, a report from Royal Pingdom finds that US visitors to Pinterest are now beginning to surpass other social sites, though it is worth noting that there is not enough data to show whether this growth is being sustained over the course of several months.

First citing statistics from site ranking service Alexa, the report indicates that Pinterest is currently the 16th most popular site in the US in terms of web traffic, leaving Tumblr at number 17. However, this still leaves Pinterest considerably behind the likes of Twitter at number 9, Blogspot at number 12 and Facebook at number 2. Pinterest also wins out in Google Trends' daily traffic estimates, which shows Pinterest climbing steadily from October last year to now, overtaking Tumblr around December.  March stats from Experian Hitwise show that Pinterest broke into the top 10 social networks, with traffic surging 50% between January and February.

However, the data is not consistently in Pinterest's favour, with stats from Compete showing that Pinterest attracted around 19.38m unique visitors in May this year, behind Tumblr's 21.6m, though given Pinterest's continued growth, it is likely that picture will change in the near future. Quantcast also shows Pinterest behind Tumblr's 50.7m unique visitors in May, at 45.8m. Finally, while a recent report from comScore shows that Pinterest saw the biggest US growth by far of all the social networks in the last year, the research firm points out that Pinterest's share of the social market is still not particularly large.