Usually I don't use social services, at least not "socially" (e.g. twitter as public text messaging). IMHO whether the service is crap or not, depends on what kind of stuff that it encourages you to do, either finding useful information, or playing boring games and pay for higher rankings.
Still like old Google Reader with its OLD social features.
I heard that with careful optimization on the server side and a clever JS may solve this. So far the default UI just demostrates the ability of reading-while-downloading.
The idea is that now the document becomes more controllable and accessible, say you can put Google Analytics in your resume written in LaTeX; or maybe an social reading service, where you can comment, annotate and share.
Unlike PDF viewers, web browers are never optimized for this kind of messy inputs. The next version of pdf2htmlEX will be focused on optimizations, e.g. smaller size of background images, hopefully that would help.
If you use HTML inspectors and remove that piece of mess, you'll find text on the html also disappear.
It's the problem of font encoding, which is one of the difference between PDF and HTML. Sometimes you cannot copy the text out of PDF, but you can read correctly.
I'm working on that problem. I made things like this so far because I think visual accuracy is more important.
