While you can certainly limit your own interests so that your searches only reveal the type and location of SBs you are interested in,  they can do the same and search wherever/whomever they please.  Thus you and I are both getting swamped by views/favorited/messages from SBs in Venezuela, the Philipines, Russia, and so many other places I'm never going to visit.

You can set up a filter in the messages sections.  It won't block them, but it will put them in a separate folder, think of it as a spam folder.  You can add filters based on distance, age, body type, etc.  You can even say a first message must contain at least "X" amount of words.