I use ao3 bout 70-80% of the time and only come one here to read or publish fics I've already published on ao3, it's unlikely that unless I've recently published something on here recently that I'll see any notifications. I usually have long wait between when I publish a fic on ao3 and when I put it on here so if you want to contact me or get to one of my fics when it's first published then it's best to use ao3!