You are right. If you just go with your webview on m.twitter.com or mobile.twitter.com you will get this:
But if you set User Agent String you will get normal site
B4X:
Dim Obj1 As Reflector
Obj1.Target = Web 'name of your webview
Obj1.Target = Obj1.RunMethod("getSettings")
Obj1.RunMethod2("setUserAgentString", "Android 2.2", "java.lang.String")
Thanks for the info - I've now tried to do a viewbiew with linkedin's new mobile site with no luck - using the user agent - this one hangs on a blank screen - loads fine in dolphin etc. m.linkedin.com