Sometimes it can be better travelling with strangers. I went to Africa with three friends and two of them reveal to be the worse travelling buddies i ever been with. They did not have money at all. They expected us to pay for them. They wanted to buy hash at every corner.
Anyway better to be alone than in bad company.
i travelled with people i met on the internet. i first saw them at the railway station before the travel. it wasn´t a bad experience, although not the best one either. the problem was that we were travelling together but acting as if we were alone. everybody had his/her own ideas on how to spend time and what to do, and was unwilling to give up on them. we ended up making plans like: ok, so now everybody goes where he/she wants to go and does what he/she wants to do and we meet here together again in 4 hours.