ABI Research just released the results of a Q2 survey of 500 US social network users about their mobile behavior. Here are the top-level findings:

• 46% of respondents (social network users) have visited social networks on a mobile device. Of this group, almost 70% have gone to mobile MySpace and 67% had visited Facebook. No other social networking site reached 15% adoption mobile adoption. 
• The biggest features consumers use when accessing a social network on their phone is checking for comments and messages from their friends, with both of these features registering above 50% for mobile social network users. Posting status updates also has proven popular, with over 45% of mobile social users letting others what they are up to via their phone.

Opus/LMS conducted a similar survey about awareness and usage of mobile social networks earlier this year with a sample of 1,022 North American users. Here's what we found:

• Roughly three-quarters of mobile phone subscribers are members of social networks – In Canada, the figure exceeds 80%; in the U.S., it approaches 69%.
• Only about 6% have accessed social networks through their wireless phones. Based on other research conducted by LMS, that figure represents between one-half and one-third of the mobile Internet user population.
• Only one-third of the sample expressed interest in mobile social activities – A short list of potential uses (such as learning who’s nearby or getting recommendations about events, etc.) elicited interest from about 30% of sample with 10% showing a keen interest.
• Accessing social network sites from mobile phones seen as a “way to pass the time” – While this doesn’t put it on a par with the Blackberry for addictive use, it does acknowledge the value of using the phone to “stay connected” with friends.

 
If we did this survey again tomorrow, we might find that some of the numbers would have grown slighly in terms of mobile social networking adoption. In our data we also found that MySpace and Facebook, the dominant online social networks also had the highest usage and brand recognition among the "mobile social networks."