In what kinds of groups is groupthink most likely to be a problem? when is it least likely to be a problem? what steps can group members take to ward off groupthink?

The correct answer is that groupthink can be a problem in very unified and cohesive groups.  The group members could be so invested in making a unanimous  decision that they do not see other possibilities. On the other hand,  It is least likely to be a problem when managers have used up all their resources and are in need of some new  ideas.  Some of the solutions for this problem are improved  meeting agenda,  balanced staff work, and constantly competing views.  

when your a dog and you need a bone.   go and eat a rabbit

new communications technology has affected the way social movements are organized because nowadays, social movements rely on social networks and the media to get different people with a similar way of thinking in contact, and thus, get them to mobilize for a greater cause.

individuals only participate in collective action when they feel identified with it. is in this aspect that social media becomes relevant, because it guarantees communication among all individuals and organizes the social actions that are going to be carried out, i.e., the social movements.

in addition, being covered by the media is important to validate the message and make it relevant in the social agenda, as well as to reach more people who can share interests, appealing to public sympathy for their cause.

in conclusion, it is by social networks and social media that social movement is given birth; by connecting different individuals with similar ideas and organizing them to mobilize for a greater cause.