Nielsen reckons around 1.6 percent of UK mobile users now access social networking sites on their phones, compared to 1.7 percent of those in the US – almost double the rate in most European countries.

It’s no surprise that Facebook and MySpace are still the big names in social networking over mobile, especially given operators’ willingness to do deals with them to trim the data fees associated with such sites. But with the big two still dominating mobile social networking, is there any room for the more niche, mobile-only social networking platforms?