I’m now using both Socialthing and FriendFeed. Although both have some similarities, there are some big differences in their functionality. Socialthing is more attractive, although it supports fewer services than FriendFeed.
Socialthing automatically gets your friends and contacts from the supported services and doesn’t seem to let you add other contacts. It also doesn’t provide an RSS feed of your lifestream or allow you to subscribe to other members lifestreams.
FriendFeed, on the other hand, lets you subscribe to anyone’s updates as well as share a combined feed of all of your activities.
If anyone is interested, I have two invites to Socialthing. Leave a comment if you want one.
You can also subscribe to my FriendFeed updates at http://friendfeed.com/mike3k.