It looks like you figured this out, but it's best to put links in the first comment under your clip (right after you post) rather than in the subtitle/caption field. The links will automatically hyperlink in the comments area, but not so in the subtitle/caption field.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .
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