One of the challenges of keeping up with social media is to ensure that you have attractive and consistent branding across all of the various platforms. No sooner do you find the right size for Facebook than the same image changes on Google+ and you need to tweak your images again.
Doing the research to find all the right sizes was always a pain. Various sites had inconsistent (and even incorrect) information, making it difficult to know where to turn or who to trust.
Thankfully, LunaMetrics has stepped forward and volunteered to be the keeper of all such mundane information, providing social marketers with a single place to turn for all their sizing needs. Thank you, LunaMetrics!