Create anonymous user ID

[emilyrbartha]

[tpadmanabhan]

Validate with Nick, Nidhi, and Josh L if needed

[tpadmanabhan]

@lianilychee need more background info

[nicolassaw]

What does this anonymous user ID refer to? If we can't figure out, then we can close the ticket and perhaps raise it if it comes up again.

[tpadmanabhan]

Adding @normaljosh and @newswim
Josh/Dan, this older ticket was assigned to Emily. Please advise per @nicolassaw input here. Thanks
cc: @lianilychee