Well from my experience dating my dh who stutters. He told me he had a childhood stutter (it was much worse than he described) after we were texting for a few weeks and right before I asked to call him. He never mentioned about blockage and it shocked me when I saw it and saw his face contort up. I would NOT put it in your profile if you want any chance. Get to know the girl online and see if you mesh. Reveal it before the date or speaking on the phone. Be honest about it but not too early on.