I pulled up the stats on ihackernews; 86% safari, 6% chrome, 2% for the other big three, but OS says 68% ios, 25% android eh? Safari isn't available on Android, neither is MSIE (2%). The OS field obviously has issues, even beyond not being able to tell the difference between Android and some other Linux machine; even though telling the difference isn't that hard.

UPDATE: I just checked from my Galaxy Nexus and it thinks that I am running Safari, it also claims my browser is 1210 days old, even though Android 4.1 obviously much younger than that;

Mozilla/5.0 (Linux; U; Android 4.1.1; en-gb; Galaxy Nexus Build/JRO03C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30