When it comes to the specific social channels SMBs are using, Facebook, not surprisingly, tops the list, with 26% of small businesses and 38% of medium-sized businesses saying they used a company Facebook page. Additionally, 20% of small businesses and 32% of medium-sized ones said they also engaged and posted content on relevant Facebook groups. Small businesses were least likely to use geolocation services, with only 3% saying they used them. But for medium-sized businesses, only 6% said they used social bookmarking sites like Digg. Read the rest at eMarketer.