What shall we learn from social networks whilst keeping Wikipedia unique ? being a team?

What I see in the strategy that could help in that direction is the mentorship. If the mentor stays and follows all his/her mentorees, he could support them at the critical stage. I'm not sure that's enough.

Regarding the risk of leaving, maybe we should think in a positive way. I actually do have a few team experience that made me happy, and that probably what helped me get through a few type 2 crisis. Is there already a place to share that ? Actually a simple link "Editor support" that would enable editors to send their feed back could help measure the editor's mood in the same way we try to evaluate the vandalism rate ?

I find that the wikiprojects are a very good idea, but I still feel very lonely in these, except for the wp:fr Biologist project (Projet:Biologie/Le café des biologistes). As it also happen IRL, this project has a long history of being a nice place. One of the main past contributor was actually hired by a 1st class French encyclopedia and do not contribute any more but newcomers joined. The main point is that if you ask something in there you get an answer and people are willing to help. All the other projects I know of are below a critical level of active people. In this regard having targeted campaigns to hire new contributors in a specific area could help. Then we need to make sure the "team chemistry" actually happens.