Hi,
Was working on a task wherein we had to add Social Pane to a form of a custom entity. We enabled the Notes for the entity (Activities was already enabled).
However after adding it to the form it was only showing only Notes tab.
The solution we found was to export the entity and change the following value to 1 for the particular form.
Saving and importing back the solution fixed the issue.
The helpful post
https://thecrmgrid.wordpress.com/2013/11/22/social-pane-control-not-working-in-custom-forms/
Hope it helps..
Nishant Rana's Weblog 
Reblogged this on Dynamicsofdynamicscrm and commented:
Very nice post from Nishant
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Reblogged this on Sreeni Pavalla.
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Reblogged this on CRM Backlog.
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Hello,
Please see another explanation on how to enable the Posts and Wall on the Socail Pane which is added to a form! (without the need of manually updating the exported Customizations XML file)
Adding the Social Pane to Custom Entity Forms in Microsoft Dynamics CRM 2013 Online – Microsoft Dynamics CRM Community
https://community.dynamics.com/crm/b/magnetismsolutionscrmblog/archive/2014/02/02/adding-the-social-pane-to-custom-entity-forms-in-microsoft-dynamics-crm-2013-online
HTH!!
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