Let me start this off by saying I. Love. The mobile site. It's clean, looks just like the site, polished and uncluttered. Gorgeous, and for once, I'm happy to use a mobile website.
I have noticed, however, that there seems to be no option to follow a tag. I will click on a tag, it brings up the page... But the "follow [tag]" appears to be missing.
Hopefully I'm not just missing something, but as someone who uses their phone for browsing 90% of the time, this would be a key feature.