Discontinued web annotation systems refer to online platforms or tools that previously allowed users to highlight, comment on, or annotate content on the web but are no longer in operation or have been shut down. Web annotation systems enable collaborative or individual note-taking on digital texts, images, videos, and other web materials. Some reasons for discontinuation could include: 1. **Lack of User Adoption**: The tool may not have gained enough users or engagement, leading to its closure.
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