Responding to tenant's request to add on a media site

I have a tenant thats been with me for 9 years and is a very good tenant.  She is a professional worker and have sent me a linkedin request to add them.  Is this a good idea?  do I ignore, or respond.  For obvious reason, I'm not sure if i want her to know my work history and/or my investing interests that will be visible to her if i add her based on the groups and forms I participate.  Whats a polite way to decline or does it make sense to add her.