"And using your cell number as identity and your contacts list as a social graph is diabolically simple." Tthe linkage of phone number and identity seems to be

"And using your cell number as identity and your contacts list as a social graph is diabolically simple." Tthe linkage of phone number and identity seems to be the main reason why there are no tablet versions of the whatsapp client. I wonder how satisfied whatsapp/facebook are with this constraint, and whether they intent to address it? It is possible to imagine workarounds for devices that don't have a phone number, but they don't seem as friction-free as the current identity system.