We noticed (thanks to a few members who reported!) that the link between BookCrossing and Twitter currently isn't working at all.
Apparently this started mid-January when Twitter did some minor but significant change.
Unfortunately this isn't a quick fix. Our programming code uses a 3rd party tool to maintain the link to Twitter, but this tool isn't updated anymore. Therefore we'll have to do some significant recoding.
From my point of view this isn't top but still very high priority. I hope to have this fixed within February.