okfn/annotator — Issue #93: Tag seperation with spaces is annoying
Author: pombredanne
Created: 2012-02-15 17:57:10+00:00
State: open

You type two words and if you forgot that this is space separated this is split in two tags, when you meant one tag.
Delicious for instance always used a comma for tag separation: https://delicious.com/help
Using commas would be better imho and less surprising