There are no shortage of travel companion sites and ‘find a travel buddy’ apps fit for the purpose of hooking you up with some loose cannon through cyberspace. The most obvious is social media and this does work: Facebook – Is the no brainer. Check general backpacking groups, backpacking...
But you may have many questions before booking a trip. What are group tours, and why are they popular? Can you join a group tour if you're travelling solo? Are group tours only for older people?