Overview

You may want to set your site/stream to read-only.

Workflow

Archive Community option

In the Administration guide Page 166, there is the Archive Community option, which will make your site read-only:

Limiting Microblog and Question posting to Admins

In the Administration guide page 133, you can find Limiting Microblog and Question posting to Admins:

Manual Method

If none of the 2 methods above attends to your needs, try this third "manual" method, which implies the use of PowerShell and the SQL server:

1. Run the following PowerShell command:

$web = get-spweb "yoursiteurlhere"

$web.AllProperties["ng-community-membersreadonly"] = "False"

$web.update()

 

2. Then in the SQL server:

update dbo.SocialGroup

set MemberReadOnly = 1

where SiteId = '<site ID here>';

 

3. Update statement example:
update dbo.SocialGroup

set MemberReadOnly = 1

where SiteId = '98658D5E-A924-447A-B6C2-53DA7FBB84EE';

Setting WebPart to Read-Only

If the issue is not the entire site but is a WebPart not becoming Read-Only even after performing the 3 methods proposed. Then please follow the steps in the article Setting WebPart to Read-Only.