For example: As of January 1, 2009, , leading Netizens around the globe to scratch their heads and ask, What the heck is a "Ning"?
Short answer: It's what Marc Andreessen is doing these days.
Slightly longer answer: It's a site where you can build your own social network quickly and easily. Which means it's attracted a fair number of folks who wanted a low cost way to build Web 2.0-ish sites based around what comes naturally (and, occasionally, unnaturally). They've now got less than 30 days to clean out their toy chests and find a new home. This has caused no end of grief for folks who've devoted quite a bit of time to building their sites.
Note: The Widget Laboratory claims to to new sites for amateur pornsters left in the lurch. (I haven't tried them, so let me know if they work.)
Ning's motto is "." I guess they'll need to change that to "Create Your Own Social Network for Anything But, You Know -- That Stuff."