UPDATE:

Yes. See for details.

And one more site:

yes put your mouse cursor on that persons avatar and a pulldown screen will come up. Click on block user

move the mouse over their picture and and a window pops up click block user good luck losing the nut

Yes there is. Just click on their avatar and when the picture comes up you will see a red circle with a line through it saying”block user”. Click it and they will not be able to correspond with you or see your Q or A or your network. Hope this helps!