FWIW, LinkedIn and Facebook do support these characters. 

From: M3 Sweatt
Sent: Thursday, February 19, 2015 10:27 AM
To: Mark Svancarek; UA-discuss@icann.org
Subject: RE: [UA-discuss] this would be amusing if it wasn't so predictable

I expect to see similar results when others attempt such updates. ;)

Perhaps this limitation can be addressed?

Sent from my Windows Phone. Replies may be brief and may have spelling errors.

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From: Mark Svancarek
Sent: 2/19/2015 8:16 AM
To: UA-discuss@icann.org
Subject: [UA-discuss] this would be amusing if it wasn't so predictable

I tried to update my ICANN profile page today: