Web 2.0 has really been picking up speed recently, and with Twitter seeming to catch up with Facebook in terms of mass popularity, let's have a look what else is out there.
Tumblr is somewhere between Twitter and a full blown blog, and in terms of customization it's pretty nifty. You can totally customise the code, and pull in data from other sources (e.g. our main content feed). Their business plan seems to involve ads on the home page, which like Twitter is made up of posts by other people you are following (e.g. Look At This Fucking Hipster). Check out ours and follow us here.
That following aspect is the big selling point for us, as a way of dragging new readers onto the mothership (www.chimpomatic.com), as well as adding some bonus data on the move, as Tumblr and Twitter are very iPhone friendly. In order to keep all our feeds and so on alive, we're using Twitterfeed, which can pull RSS content from any source and auto-Twitter it for you - hence our always up to date Twitter feed. That Twitter feed is then handy to post everything to your Facebook page.
Yahoo's Fire Eagle and Google's Latitude are likely to take off next, allowing you to easily update your location for selected people to find you. While there's something of a privacy issue, I don't think too many people will really care - or will select exactly who they wish to share that data with. Several location based social-networking services are already using the Fire Eagle service - for example Dopplr (there's that dumb spelling again), which is a travel based info-sharing service. Haven't quite got my head around that one yet, but will keep you updated...