Music video site Vevo has revealed that its UK users streamed 177m videos in January, an increase of 120% since its UK launch last April.

Vevo also announced that it now has 12m unique monthly viewers in the UK, an increase of 23%.

The report, which covers May 2011 to January 2012, shows that while mobile streaming is still a relatively small part of Vevo’s business, mobile use among users is growing fast.

Mobile streams have doubled since it launched in the UK to 12.4m for January 2012, while the mobile app has been downloaded 1.4m times.

Vevo said viewer engagement is increasing, with an average of 15 videos watched per viewer in a month. 

In January each user watched an average of 70 minutes of video, with the greatest amount of time spent viewing music videos via mobile and tablet devices.

Last month we reported on Vevo’s decision to force its users to sign in through Facebook, which at the time seemed like a questionable move, but has since proved to be a success.

Facebook said that it saw a 200% increase in registrations after a month.

Vevo’s latest report indicates why it decided to make the move to forced social sign-in – 7,500 acts use ‘Vevo for Artists’ on their Facebook pages and it has achieved a 61% uplift in impressions in published stories on Facebook since it integrated with Open Graph last October.

There have even been reports that Vevo plans to take this relationship a step further by removing its service from YouTube and signing a deal with Facebook that would see the social network host its service with Vevo sharing the ad profits.

Globally Vevo achieves 3.3bn streams each month by offering a collection of music videos, exclusive premieres, originally produced series, exclusive concerts and events, artist interviews and celebrity, fan and editorially curated playlists.

It’s been an attractive proposition for advertisers as well, working with 50 brand partners including Coca-Cola, BT, Unilever and McDonalds.