You can follow yourself.
I managed to follow myself.
Go to the URL type in section, type duolingo.com/(your profile name) with no parenthesis, and click follow. It gives a notification and you now follow yourself.
Odd...you only see the follow button if you actually type in the URL you said, not if you go to "Your Profile" from the dropdown menu. Well, I'm following myself now! If only they would follow me back...:P
I don't know how but I just got a notification that NoahGamboa1 added me NoahGamboa1 to his friends I thought you could follow yourself but you couldn't have a follower be yourself.
That happened with me too.. I mean, i like me and all but, worth following? No thanks... yawwwwn! I'm trying to find out how to ditch me now. (Shhh..)