- Bleys
- Blind - Professional Community
- Blind Wiki
- BlinDating
- Blindchat
- Blindfold Greeting Card
- BlindID - Live, Anonymous Chat
- Blindlee: Love Is Blind Dating
- Blindmatch anonymous chat
- Blindmate: friends + dating
- Blindr
- BlindSq Event
- BlindSquare
- Blindstory - Watch Stories
- BlindTiger - Connecting Campus
- Bling Logistics Network
- BlingBling - 让小仙女闪闪发亮的相机
- Blink - Make New Friends
- Blog Reader | Stylehills
- Blogg for Blogger
- Blogg.se
- Bloggercube
- Bloggplatsen
- BlogIt - Blog de n'importe où
- BlogTouch for Wordpress.com
- BlooCue
- Plura: Meet Partners & Friends
- Bloomz: For Teachers & Schools
- Blossom App - by Kidizz
- Blowout.
- Bluddle - Asian Dating App
- Blue Social - Networking IRL
- BlueCircle: Green Jobs & Learn
- Blue Corvus The Bird
- Blue Fever - Self Care Support
- Blue House Okinawa