I am sure http://www.43things.com and http://www.flickr.com as companies know each other and there should lots of users who use both apps and also add tags

Why is it that they are not consistent with each other regarding the tag separator

In 43things, one has to separate tags with commas while in flickr, space is a separator…

Any other user with the same issue ?

Which application was released first ? flickr or 43things…