WHO has the X-factor? The online kind, that is.
If the presidential election is won solely on the number of Facebook likes, then Dr Tan Cheng Bock, 71, is the front runner.
The former Member of Parliament even has apps to reach out to followers on iPhone and Android 24/7.
In the run-up to the Presidential Election next month, all four Tans have embraced social media, some earlier and more actively than others.
Related story: Tan Cheng Bock turns to apps for online edge