Now that I’ve tried Soup, I can say that for me it works like a cooler version of FriendFeed (or Multiply – but without the annoying ads). It collects posts from other sites, which can be convenient if you have friends and family who would like to keep up with what you’re doing. Of course, it’s also possible to use it like any tumblelog. I haven’t had mine for long, but I’ll keep exploring it and see what else it can do.
Tumblr (for me) is a great ‘scrapbook’ – in my case a photoblog (though like I mentioned before, I also like to post links and other shorter entries). To be honest, it took me a while to figure out how to use it, but when I did, I fell in love with it. It’s so – creative and do-it-yourself, compared to more evolved blogging platforms like WordPress or LiveJournal. I still haven’t tried Publr or Plurk. In fact, I still haven’t figured out exactly what Plurk is and what use I might have for it, if any.