Southwest Cyberport undetected spyware?

I noticed my pc connecting to 216.184.20.83 continuously yesterday. I traced the IP to Southwest Cyberport ISP, and was able to ftp into several directories. The only one with info other than style sheets was /smedia/lb/productivitybooster, which had the following list:
*digg.*
*slashdot.*
*consumerlst.*
*engadget.*
*gizmodo.*
*valleywag.*
*fleshbot.*
*wonkette.*
*kotaku.*
*deadspin.*
*kinja.*
*jezebel.*
*autoblog.*
*tuaw.*
*downloadsquad.*
*joystiq.*
*reddit.*
*myspace.*
*facebook.*
*youtube.*
*video.google.*

I was unable to find any info on this issue, and couldn't find where my pc was getting the instruction to connect. The only thing I was able to do was to block the site in my router. Have any of you seen this, or heard of it? Can you help me figure out what is going on here? Thank you in advance for any direction you can give me. My CA antispyware did not detect, and Hijack This doesn't show anything unusual. Kat.