What are some alternatives?
When comparing memit and weheartit.com, you can also consider the following products
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Pinterest - Pinterest is a visual discovery tool that you can use to find ideas for all your projects and interests.
Imvges - Collect Images with One Click, Get Traffic to Your Site, No Content Filtering!
Dragdis - Drag & drop anything anywhere.
vi.sualize.us - A social bookmarking website for visual contents — vi.sualize.
Pinboard - Pinboard is a personal archive for things you find online and don't want to forget.