how to extrude neighboring vertices without creating a face in between? As in question. Check the picture. I do not want any faces inbetween.
Kind regards.

Please see the picture:
1) - original
2) - after extruding using E (+Z)
3) - after 2) and deleting the faces (not what i want)
4) - after using Edge -> Extrude edges (as in answer below) -> That is what I want, sorted. Thanks
use CtrlV to get to vertices menu, then extrude vertices will extrude only the vertices.