Writing tools that can help you improve your grammar and punctuation for social media writing include Grammarly, ProWritingAid, and Hemingway. Grammarly is a popular and comprehensive tool with both a free and a premium version, which checks your writing for grammar, punctuation, spelling, style, tone, readability, and plagiarism. It also offers suggestions for vocabulary, clarity, and engagement. ProWritingAid is another powerful and versatile tool with both a free and a premium version that checks for grammar, punctuation, spelling, style, readability, and consistency. Hemingway is a simple and free tool that focuses on improving readability and clarity by highlighting sentences that are too long or complex. It also provides suggestions for simpler words, stronger verbs, and fewer adverbs. All three tools can be used as browser extensions, web apps, desktop apps, or mobile apps on various platforms such as Gmail, Facebook, Twitter, LinkedIn, WordPress and Google Docs.