Diigo and Pinterest

I am unfamiliar with these tools so I got some resources from Wikipedia and YouTube. Diigo is a social bookmarking website that allows signed-up users to bookmark and tag Web pages. Additionally, it allows users to highlight any part of a webpage and attach sticky notes to specific highlights or to a whole page. These annotations can be kept private, shared with a group within Diigo, or be forwarded to someone else via a special link. The name "Diigo" is an acronym from "Digest of Internet Information, Groups and Other stuff"—Wikipedia.
https://www.youtube.com/watch?v=eJjobCRbT3I –YouTube

Diigo looks like a practical tool to help people curate much information on the Internet. I like one of the features that highlight any part of a webpage and attach sticky notes to specific highlights or a whole page. It would be useful to help students collect, organize and share online information.

Pinterest: Pinterest is a web and mobile application company that operates a software system designed to discover information on the World Wide Web, mainly using images and on a shorter scale, GIFs and videos. Pinterest is a free website that requires registration to use. Users can upload, save, sort, and manage images—known as pins—and other media content (e.g., videos) through collections known as pinboards—Wikipedia.
https://www.youtube.com/watch?v=TKmcQsS6xAM--YouTube

I like sharing interesting/beautiful photos or videos to my friends and family, so I am full of curiosity about this tool. However, its homepage might be a little bit messy. So many pictures on the website distract my focus. I was not sure which one meets my needs. I need to spend more time to explore it for its benefits.