Twitter can be a powerful marketing tool for nonprofits. With 330 million users, it offers the potential to increase brand awareness across a vast audience. But Twitter is a unique animal among the species of social media platforms out there. Brands — including nonprofits — must learn and practice some unwritten ground rules to ensure their tweets garner goodwill rather than lose favor. Just as there are a multitude of ways to find and engage loyal champions of a nonprofit’s mission, there are also some worst practices marketers should avoid.