The number one social networking website Facebook has been accused of blocking the importing capability of Twitter's Facebook app that basically helps to find which of your friends are on Facebook.

"Facebook has notified us that they have blocked the update to our application, and we are working on a resolution with them," Twitter reported to Techcrunch.

It is believed to be caused by an undisclosed issue which the Facebook spokesman refused to tell the Telegraph. In any case the application works just fine on Linkedin, the other major social networking websites that Twitter added on its list.

Twitter, a micro-blogging site is very small but is growing at a faster rate. Facebook tried to merge Twitter in 2008, failed to do so following which it released , ‘status update’ a similar feature that of Twitter.