The social sidebar is displayed on already saved documents (new documents are still not reachable from other users so there is no social sidebar).
This is the number of times a diagram has been visited by users other than the author.
This is the number of times this diagram has been used as a template to make another diagram. If somebody other than the author re-uses it, the author will receive 10 picks as a bonus.
This is the number of users that liked this diagram. Once you add your like to a diagram this will be shown in your profile, and the author will receive a 5 picks bonus.
Using this field you can donate some of your picks to the author of a diagram you like, as a way to show appreciation for a good work.
Click on 'comments' and the comment section of this diagram will drop down. The author of a diagram can moderate the comments he receives.