When receiving a notification on the mobile app, it always displays the username of the person, whether it was a reply, follower, like, etc... However with the website, it only displays a name when the said person follows you. While it's not a big deal for replies since you will know who it is as soon as you go to read it, it would be nice to see who liked your posts and comments, since there is no other real way to check for that. Surely it's not about anonymity, because you could see their name on the mobile app, or people with more unique and personalized avatars (such as me) would be easily recognizable. Seems like a lot over a small thing, but hey, convenience.