Many of OOTB Portlets add an entry to social activity table like Web Content, Document Library, Blogs etc.
Only few of portal use social activity but still it adds an entry to SocialActivity.
There must be a property to disable those entries like social.activity.disable which may have value true/false.
With help of this we can skip this overhead.
Here I am not talking about Social Activity Settings!
I developed a service wrapper for the same which checks the property and add an entry if its true.