Who's using social networking functionality as part of their online services? Movie sites. Job sites. Dating sites. Search sites. The list is endless.

Well, not exactly endless. Judith Meskill (Social Software blog at Weblogs Inc) has a scary-long list of web sites that are using social networking functionality as a component of their online offering.

Don't forget to check the 175+ comments, most of which contain at least one (if not two or three) sites for Judith to add in her next version of the list.