If you havnt already then you need to set up accounts with Twitter and Facebook. Then everytime you publish a hub there is a section at the bottom which allows you to link your hubs to these networks. you can also press the 'Tweet this' button at the top of your hub in the right hand corner, or the 'Like' button for facebook which is right next to it. I use both Facebook and Twitter to link my hubs and i get a lot of traffic from them. As for Kontera they are not a site in which you can link hubs to, they put advertisments on your hubs like Google Adsense, you can sign up with Kontera through the affiliate settings on your account page.