Stalkr - (pronounced stalker) a person that you don’t know who tries to Facebook you or become your friend on MySpace or indeed on any social network.   The term also apples to someone you may know a bit who decides to relentlessly pursue a more active online discourse than you would like.  Would also apply to someone you are not following who frequently talks @ you on Twitter.  Essentially a  stalker in the 2.0 style of Flickr, Tumblr etc.   

An interesting insight into online professional networks can be found here with an audio discussion between FT management writer, Adam Jones, and LinkedIn’s Kevin Eyres. LinkedIn positions itself as a professional - as distinct from social - networking community in which business people can build contacts, get expert advice and manage their careers. Strictly no biting zombie applications or virtual sheep being hurled at one another here, methinks.