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BackType is a service that lets you find, follow and share comments from across the web. Whenever you fill out the "Website" or "URL" field in a comment form when you publish a comment on a blog or other website, BackType attributes it to you. We give comment authors a profile featuring all the comments they've written on the Internet.

Site lets teachers post a question online. Students then respond via webcam (no account required) and have their (moderated) comment added to a really great-looking video wall online. Site does cost $65 annually, but that includes 10 walls and virtually endless questions/responses.

Add chapter place marks and comments to YouTube and Vimeo videos.

Very interesting site allows video viewers to insert comments at specific points on video timeline.

Users create slideshows by uploading images and audio. Shows are then synced to audio. Sharing, commenting, embedding all possible.

Create narrated sketches using just a mouse. Can also add text. Shows can be shared, commented upon, embedded.

Sketchcast is, apparently, dead.

Enter a problem, and a unique URL is created. Once shared with others, a group can collaborate by adding questions, comments, solutions, etc. Very easy to use and effective way to solve problems.

Site allows access to Youtube videos without ads or (best of all) comments. Users can browse, search, even access their YouTube accounts.

Browser button add-on that eliminates superfluous items from YouTube (ads, comments). Just install in the browser bookmark toolbar, browse to the desired video, and click the Quietube button.

Another tool that allows viewing of YouTube w/o ads or comments. Enter a video link, and Safeshare creates a new link to the video in a page w/o the distractions.

Allows users to create custom social networks and embed them into their own sites.

Create and playback drawings and paintings. Also features contests, community groups, more. Powerful, Illustrator-like interface.