I don't have that one on mine, I had never noticed that feature. That's pretty cool though.
ETA: It's just easier to post, hit the checkmark, and say subscribing for me. I have an older phone that the newer mobile sites don't agree with. Right now I'm on my computer, but, when I'm on my phone I just say subscribe and keep moving. Sorry if that upset someone or if I sounded rude, I'm not trying to. I just want to subscribe so I can watch for eggs and such I may want.
Not rude at all I just wanted to maybe make it easier for you than having to post but sounds like it's easier the other way !