FriendFeed’s imaginary friend capability might just make it the easiest (dare I say best?) way to follow folks from all over — without them even having to be a FriendFeed user.
You can keep track of your friends that don’t use FriendFeed by creating “imaginary friends.” For example, if you know your friend’s Flickr username, you can create an imaginary friend with that Flickr account, and you will get notified every time your friend publishes a photo.
Brilliant!
I had been experimenting with using Tumblr as an “aggregator” just for my stuff, but FriendFeed seems so much more useful to aggregate myself and follow others.
I can be found there at http://friendfeed.com/solotech
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March 3rd, 2008 
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I find that feature quite useful myself (having a bunch of friends who couldn’t care less about yet another social network), but I have to say that 30boxes has been doing that for a while now, and even a bit better, as they use a person’s email address to track their activity over various different services.
… oops. Ya know, I have a very old note to myself to check out 30boxes but just never got a “round-tuit”.
The wrinkle is, I don’t often know the email address folks are using on other social networks. I’ll give it a look soon though.
[...] Now, start adding friends that you want to follow. Here’s the downside: They also have to setup a FriendFeed account. If they haven’t, you can manually create them as an “imaginary friend“. [...]