Raindrop.io, Pinterest, Pinboard, SemanticScuttle, SubtleTV, Omnivore, Jumpstick, Cosmos: Curate your universe, Pointless Sites, StumbleUpon, Enterpix, GGather, Draggo, Bunklist, Tizmos, BlogMarks, Instumble, BrandBriefer, Bookmark Ninja, Juxtapost, SpotterBoard.com, ShuffLink, launch.menu, Flipora, Empeopled, FAVable, Gimme Serendipity are some alternatives to Viralwalk.