I think sites like Facebook and Twitter only have the option to view the full site because its creators expect lots of people to use the site on a mobile device, so they make an advanced mobile version for this purpose. Most social networking websites are like this, but sites with less traffic don't usually have the mobile option. The PC administrators can only do so much with the features given by the forum host (vBulletin), and having a full mobile option might not be included in these. The mobile version of PC does suck, I agree. Hope this helps some xx
