Comments

Each Twine has it's own separate commments for a bookmark and this makes the effectiveness/importance of each comment pretty low.

I commented on a bookmark that was posted in several Twines, but only the people who view the bookmark in that particular twine will read my comment, which isn't that big of a deal except that once this goes public there will be abuse.

It takes a few clicks for someone to simply paste a url, if the name of the site doesn't look like spam people might go there based on what twine it is in, but if it is spam and you comment "spam" in the art twine but someone else sees the bookmark in the cool twine they only see the comment the spammers buddy put in there saying "cool".

The spammer will use the weak comment priority to boost the importance of the bookmark by adding a comment to each twine but we won't bother because we'd have to comment over and over to get our point across and we don't have the time.

So yeah, there you are, the comments system will encourage spam I feel.