I'm not always a fan of "round up" posts or influencer lists, but this one is a BEAST. Lots of tools in here that I've never seen before and a few that I'm sure we've all used & adore. This list consists of 50 pretty big names in the online marketing space (although I'm kinda biased cause I'm included) -- They all weigh in on their single, most-must-have social media tool. It's a great resource going into the new year.. Check it out - I'd love to hear what tools you're all using that may not have made the list!