In reply to Filip_F:
Val de Mello has a good scene and a busy campsite where you should be able to find partners. Mix of bouldering and multipitch rock, with big mountain routes within close reach. Some sport routes too. Theres a MelloBlocco bouldering festival there each year in May which might be a good time to land?
Aillefroide in the Ecrins also has a great climbers campground, the size of a small village, and I found partners there after rocking up on my own. Its also high altitude, so the hight of summer is best.
Céüse is another good summer venue (stays cool), the van parkups are free (or were when I visited) and generally very sociable.
Riglos has some of the most mind blowing 'sport' routes. The scene there is not so big as the previous suggestions but there is basically one bar in town where its easy to meet people and partner up. Parking up was relaxed, in the village.
Fontainbleau is apparently worth a look too