How to Easily Collaborate on Google Drive with Online Annotation | TIC & Educación | Scoop.it
Google Drive is quickly becoming one of the most popular tools for those interested in collaborating on documents, presentations, PDFs, and spreadsheets.

Google Drive’s native tools (including comments, a chat feature, and different levels of editing powers) are a great set of features, but there are specialized annotation web apps available that integrate with Google Drive and make communicating with others about your document, PDF, or image file easier and more effective.