Social networking continues to gain momentum in the US and around the world. According to a study on social networking trends by Nielsen Online, the amount of time spent on social networking sites in the US has shot up by 83% from a year earlier.

Nielsen Online data reveals that Facebook users in the US collectively spent 13.9 billion minutes on Facebook in April 2009, a 700% rise compared to 1.7 billion minutes spent over the same period the last year.

However, MySpace recorded a 31% drop over the past year as the social networking users spent 5 billion minutes. Nevertheless, it still occupies top slot as the No. 1 social networking site for online video, ahead of platforms like Facebook and Stickam.

Nielson’s data puts Twitter at 5, going by the overall minutes spent by users. The site is still growing as users spent 300m minutes in April, a 3,712% increase from last year.

Blogger, Tagged.com, MyYearbook, LiveJournal and SlashKey have also seen some degrees of growth; Tagged.com saw 998% growth and LiveJournal posted 273% compared to April 2008.