Been getting a few comment spam attempts in the last six months that use a somewhat clever way to become "invisible" to both the admin and to the viewer but will show up on search engines.
These attempts put an innocuous line or two of comment to the post and then have the following HTML code embedded in the comment:
font style="font-size:6px;color:#ffffff;visibility:hidden"This makes whatever follows to be very tiny (only six pixels tall), white in color (invisible against a white background) and hidden. What follows is the inevitable PPC (Pills, Pron and Casino ads). I had been getting a couple of these per day -- my filter caught the first one and held it for my review. Their problem is that I view comments as plain text so the HTML skill of these "133T haxors" was all for nothing and I highlighted the offending text, clicked on a button and now any attempt at this never sees the light of day. I would not be commenting on this as it has never been a big issue, like I said, a couple/day if that. Last night, I had 23 of them all within a 10 minute span, all from different IP addresses -- and five of these were either European or African in origin. All of these IP addresses are now in the bit bucket -- suckers, you just fed me your seed corn. Idiots. Fscking script kiddies. Making the big bucks, yeah right...
