Buttons all around... Or not?

Everyone loves buttons! It's not exactly the message I want to scream to the world but buttons really look nice on a webpage and are definitely working. I have some profiles on social networking sites and want to promote my profile with some appropriate picture with logo of the service. User who knows the service will immediately recognize it and doesn't have to think what it means. He doesn't have to read all the links.

So why is so hard to find these buttons? Try to find it on LinkedIn for example. I feel like a hero after I finally made it... But at least they provide it! For example Listal doesn't (but ok, it's new service so I'll wait some time). Do not underestimate this promo stuff guys, the impact is much greater than you think!