Salesforce can give an accurate count of likes for feeditems and feedcomments,  but,  there does not seem to be a way to gather this information programmatically.  I can get a count of likes on feeditem because it's rolled up onto the feeditem record or I can use the feedlike table in a sub-query and count the rows returned.  However,  I cannot do the same for feedcomment.  How are Salesforce doing it?