To learn rhizomatic one needs connections.
The more connections the better, because knowledge and learning is in the connections. *)
That is why I strongly agree with people who do connect discussions on facebook with those on twitter. This is a very connective and rhizomatic idea. Open up the group and add new connections.
Daniel Clark shares some knowledge about open and closes group processes: The American psychologist Irving Janis (Janis, I. (1972). Victims of Groupthink: a Psychological Study of Foreign-Policy Decisions and Fiascoes. Boston: Houghton Mifflin.) developed the concept of “groupthink” to describe irrational and even dangerous decision-making that can take place within closed groups. https://learningshrew.wordpress.com/2015/05/17/rhizo15-balancing-cohesion-and-openness-in-communities/ . Makes me think of the secret history of Donna Tartt.
This group think is a danger to rhizomatic learning. A mass of New connections are necessary to open up new views and knowledge. Rhizomatic learning seems to be a rather creative learning process and not a conservative learning process.
Mariana Funes wrote a very interesting blog on this group think
*) This note is added November 2016, after reading https://mdvfunes.com/2016/11/02/predicting-badly-or-why-we-need-an-external-observer/ . as a comment on that blogpost. More connections are a means to avoid groupthink. I need to stress that my point of view should be clear here. I am writing as a student and a member of different groups and networks and not as a member of one group.
So if in #rhizo15 a student is tempted to join the crowd and the groupthink, other connections (colleagues, friends, books, and of course teachers.) could help to avoid group think.
I do agree on the dangers of an in-group. You say that massive connection is a potential way to avoid the danger. This obscures the issue that if an in-group exists, then newcomers may not be forthcoming or may come into the group and leave without influencing it.