Mobile research company Ground Truth has published a survey that shows more than half of the time spent on the mobile internet is spent on social networking sites. The US-based research said that 59.8% of online time was spent on social networking sites. Portals took 13.7% of consumers' time, operator sites took 9%, messaging 7.4% and downloads 1.3%.

Mobile-focussed sites airG, MocoSpace and mbuzzy were all visited for an average of over one hour per week.

A new study has been launched today to investigate whether there is a link between the use of mobile phones and long-term health problems such as cancer. It's called the cohort study on mobile communications (COSMOS) and forms part of the Mobile Telecommunications and Health Research Programme, which is funded by government and industry.

COSMOS participants will be from the UK, Denmark, Sweden, Finland and the Netherlands. The study will run for 20-30 years and will follow the health of at least a quarter of a million participants aged 18-69. The UK arm of COSMOS is being led by a research team from Imperial College London.

Nokia has just reported its first quarter financial results. Sales and profits were both up year-on-year, with net sales reaching 9.5 billion Euro. Device shipments were up 16% year-on-year to 107.8 million units, with sales of 'converged' devices – smartphones and mobile-enabled computers – up 57%. In addition, 10 million Nokia smartphone users have downloaded the company's free sat-nav service since January.

However, CEO Olli-Pekka Kallasvuo warned that the company continues to face tough competition at the high end of its mobile device portfolio and challenging market conditions on the infrastructure side.