Lijit is similar to personal network services like Ziki, these are services where you can collate all your web 2.0 interactions…I like SuprGlu as it is in a blog format, but Ziki and Lijit are different as they are in a network environment. I suppose Jaiku is similar, but its focus is moreso on manually posting about what you are doing.
Identity sites like claimID, simplifID, Namyz are kind of similar as personal network sites, but they are not networked in a social environment.
Then there Hictu which displays your current IM network status, ie. you are able to see the availability status of a person across various services…it also serves as an online contact book.
Basically Lijit, like Ziki, is a place to manage all you online identities, further to this people can then search across all your content, including content of your contacts, etc…
Lijit believe if you are searching for something you can search across the social filter of your Lijit contacts…so far Ziki lets you search in the content of one user, but not across that users network.
When you join Lijit it attempts to find your username across several social networks, you can also manually add a feed. Then what it will do is re-syndicate a stream of all your stuff just like Jaiku and Ziki. Add some contacts and search across them.
From the website:
“What if, you could search a person?
A single search for ‘television’ through that person’s eyes could returns blog posts the person had authored as well as bookmarks they made of TV related content
What if, you could search a group of people, through a person?
What if, you could search a group of people and their connections, through a person?”
He is a random example of a user.
This is the idea for Topic Network services like Squidoo and the rest, the difference here is that it is more intimate, as you are searching across your contacts and degrees of connection thereof.
At the moment I use Ziki for personal content management, reason being is that it doubles up as an expert locator, ie. you can describe yourself with tags, then you can search the network to find people that match your search term. Further to that, when you add someone to your network you get to privately tag them.
Ziki also allows you to upload your OPML Reading List.
[ADDED: Searching your Ziki network is coming]