Is there a well-known free webpage in Europe where you can find hiking partners to go on > 4000 m mountains?
For bouldering and climbing it is usually not a problem to find "new friends", since I always go at certain times to certain places. But this does not apply to mountaineering... Typically the people I go climbing with do not go on difficult mountain tours...
To me it is way more safer to go with other people hiking than alone.