There's basically 4 types of webcam tripods available:
1. Desk clamp tripods with armature or gooseneck extensions.
2. Full-size free-standing professional tripods for conferencing or staged scenes.
3. Desktop mini-tripods for close-ups and convenience.
4. Wall mount web camera arm brackets.
The benefits of buying an external Mac webcam with tripod mounting hole are twofold: Image stability and precision positioning. Most Apple compatible web cameras have flimsy if somewhat usable flip-clips that all too often largely rely on gravity to cling precariously onto a computer monitor or MacBook laptop's screen. With a real tripod you can assure stable, fixed positioning that may be critical for scene continuity and a vibration-free razor sharp image during Skype sessions, stop-motion animation grabs or YouTube video capture sessions.