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Are those bugs, or has the spammers' scripts just failed in a hilarious fashion? The first example has "ttp//" simply has just written for the subdomain, something Hubski probably wouldn't (and shouldn't) be filtering out.
The second post has %20 at the start, denoting the url was submitted with a space in the front of it. This is something that Hubski can definitely filter out as it may affect legit posters too, just call a trim() function on any url submitted.