Tabbo lets you accomplish two goals. First one is really simple - you can show your friends/readers stuff that you like.
The second derives from that - when you show these things, you promote them. The fact that you like it makes it worth promoting. You, a real person, as opposed to marketing guys. You're far more likely to spread the word about ideas that are of a high value to society, but don't have resources to market themselves. Think Linux vs Windows. Linux (as a whole) is great and all, but doesn't have that much money behind it. That's why you notice Windows everywhere and the penguin barely ever ventures beyond news sites for geeks. On the other hand, there are millions of people who care a great deal about Linux, while Windows doesn't have that many eager fans. Tabbo simply provides an easy way to tell others "look, these are the things I think you should check out - I love them". Just pick your favorite items, get the code and paste it on your blog!
Tabbo was created and is maintained by two friends - muszek (Mateusz Mucha) and tomekg (Tomek Głogowski).
Mateusz goes nuts about anything Open Source. He uses Ubuntu on a desktop and Debian on a server and has typed these words in Geany. His favorite websites are Wikipedia, Slashdot and Last.fm (his profile suggests that Pixies were the greatest band. Ever. Really. No, your favorite band doesn't even come close.).
Tomek is a man of few words. Thats good, because when he's not talking, he's coding.