When many publication and bookmark posts are displayed in a list, then there is a lot on the page - except space. This is why we need to abbreviate titles and other information such as the titles of journals or conference proceedings. A while ago, we had lots of hovers everywhere on the post-lists but we found that they were too obtrusive. Now, you can see the unabbreviated information as lightweight hovers when moving the mouse over one of the abbreviated titles. Seeing the non-abbreviated version is sometimes necessary to distinguish publications which appear in different versions for example in proceedings and in a journal or simply in an online archive.
Happy tagging!
Jens