Facebook, Twitter, Google+ and Pinterest—all social media juggernauts worthy of your time and interest, especially if you want to use them for marketing, prospecting and client engagement—have different requirements when it comes to posting images. What passes for the right size of a headshot in Facebook is not the same for Twitter, etc. The end result, too often, are poorly placed images of either yourself or your brand that look bad and appear unprofessional. And while you could Google the picture sizes for all of these platforms, LunaMetrics has a handy cheat sheet for them all, which they promise to update regularly. What are you waiting for? This one needs to be bookmarked.