Sometimes, when I come back on profiles, I don't remember if I already tried to add them as a friends. I don't know if on my first visit I couldn't make th request for any reason (like more than 100 requests) or if the person denied my request. I don't want to ask the person a second time (or more) and in a way, harass them. It'll be nice if I can know that I already tried and that it didn't work out.