What are some alternatives?
When comparing Raindrop.io and memit, you can also consider the following products
Pocket - When you find something you want to view later, put it in Pocket.
weheartit.com - We Heart It lets you create an online album (a heart) with your favorite images and videos.
Tagpacker - A free tool to quickly collect, organize, and share your favorite links.
Pinboard - Pinboard is a personal archive for things you find online and don't want to forget.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
vi.sualize.us - A social bookmarking website for visual contents — vi.sualize.