Taken from The Urbach Letter:
ItsNotWhatYouKnow, or INWYK (pronounced “In-Week”) for short, is listed here for completeness, although it’s not yet on my A-list. My sense is that INWYK has promise but needs to attain a larger membership base before it’s considered in the same peer group as Ryze or LinkedIn. Still, it has a good feature set and an attractive interface. Some cool features are a world map, graphically displaying where your contacts are concentrated, and other visual ways of scanning your personal network. It’s important to realize that all of the services mentioned in this article are rapidly evolving and adding new features. Frankly, it’s impossible to know which one will come out on top. I’m hedging my bets by semi-passively signing up for the likely candidates. I’ll continue to watch what develops and allocate my time and attention accordingly. I believe these new services will become “mission critical” for business quite soon, and recommend being in at an early stage to take full advantage.