It's the Skype symbol except it's in pink instead of blue.
What is Pink's Skype name?
If you search for Pink's real name, Alecia Beth Moore, on the messaging service Skype, then you do find a few results.
One of them is a user with the username alecia.beth.moore and her location states that she's in LA.
I don't know whether it's an impostor or not as I haven't sent them a contact request - but I do know that Pink moved in to a luxury home in Malibu with her husband Carey Hart back in 2010, so it's possible that she's in the Los Angeles area and using Skype...
This is a picture of the place they bought together:
And here's a photo of the happy couple, just in case you need to identify them from their Skype profiles:
