I hesitated to post this, as I know Strava bores some to tears, but if you don't ask, you will never know. I only use the free version for my own use to make sure I'm putting in some effort during my commute rides. All of a sudden, I have guys from Mexico and Brazil sending me "Kudos" messages almost the second I complete them. I really don't know why, or what I'm meant to do with them. Is there a code of conduct where I'm supposed to reply, or is it just a thing to attempt to increase their own following?