Personally, I don't anymore. My fluency is currently pretty good (bad today though for whatever reason) but I prefer to just "say it" after I hit a few blocks. I don't think you need to put it in your profile. I think the profiles are the parts of you that you love and want to emphasize or share. If you want to share your stuttering there then that is cool too. Depending on what you want from dating... "Those Who Mind Don’t Matter, and Those Who Matter Don’t Mind". The women I've dated never cared because I had interests and engaged in conversation. If you're not sure if you want to just hook up or "date" - I think the same advice applies. Some people do suck.. no harm in mentioning it while messaging if you are unsure. I've been fortunate as far as "internet dating" but I have overheard toxic stories as well..