Samsung was the top handset manufacturer with a market share of 22.4%, while RIM led among smartphone platforms with 41.7% market share in the US in May 2010, according to data released by comScore.

The firm’s data between Febuary 2010 and May 2010 shows that Samsung was followed by LG with a market share of 21.5%, Motorola with 21.2%, RIM with 8.7% share and Nokia with 8.1% market share.

During the same period, Motorola’s market share was down by 1.1 percentage points to 21.2% from 22.3% between Febuary 2010 and May 2010, while Samsung gained a market share of 1.0 percentage points, RIM gained by 0.5, while Nokia fell by 0.6 percentage points.

RIM was the leading mobile smartphone platform in the US with 41.7% market share of total US smartphone subscribers, falling 0.4 percentage points versus the prior period. Apple gained second spot with 24.4% market share, followed by Microsoft, Google and Palm with 13.2%, 13.0% and 4.8% market share, respectively.

According to comScore, in an average month during Febuary through May 2010 time period, 65.2% of US mobile subscribers used text messaging on their mobile device, up 1.4 percentage points from three months prior. Browsers were used by 31.9% of US mobile subscribers, up 2.3 percentage points, while subscribers who used downloaded applications made up 30%.

In addition, the firm found that 20.8% of mobile subscribers accessed social networking site or blog, an increase of 2.6 percentage points from 18.2% for three months ended Febuary 2010.