Loopnote is a generic type simple blog in a social network, where subscribers can easily be notified by email, RSS, IM or SMS…leave comments and also send private notes.
Creating a loop is like your blog, but way much less committment than a blog, plus you can set up many loops…so for this purpose loops are more effective than standard blogs. Loops are like topics, you can use them in a disposable way if you like, as your loop (topic) may only be relevant for a day or a week.
It’s basically noting/blogging in a social network with plenty of delivery methods, the bonus is as a user you can create lots of loops.
I wonder if they will have multi-authored loops, it is a different model to CommonGate, but they have a similarity…it also reminds of some me of list sites, but instead if a list you are posting blog-type entries.
Come to think of it another similarity is Twitter and Zemble, and also del.icio.us (note, this is for links not notes), basically you are creating a channel for people to subscribe to your note alerts.
Reason I say del.icio.us, is that people can subscribe to one of your tags to get updated on the latest, well Loopnote is making a product out of this, and it’s not limited to links. In comparison to a users del.icio.us tag, instead of a tag space they have a blog (loop) type interface, and you can post notes including images, links, etc…
Another comparison would be like note services such as ShortText, this is no way near as a fully-fledged system as Loopnote, but it has a similar idea where the blog format isn’t the only way to post and keep people updated with the latest, although the updates in Loopnote are delivered in many ways.
[ADDED: Sponit seems to be simple generic social network blogs]
[ADDED 21/12/06: FeedXS seems to be similar to both Sponit and Loopnote]