I have a suggestion for a feature on the website that I think could be useful.
like the title says it is about collaborative tab writing.
I think a lot of people including me have sometimes a bit of difficulties to to decypher some part of songs and then can't post a full tab because of this, generaly the story ends by posting no new tab while you can tab most of the song but only not that particular section, that's where collaborative tab writing could be useful. People can add the bits that they discovered, found, decoded while hearing or playing the song so the tab can be completed.
I myself tabbed for example a song that isn't available on the website but I didn't post it since I couldn't complete some parts of it.

Yes. You could "invite" you're friends to help you on a tab say, and then you couldn't invite them to help for 4 hours afterward....