I’ve just loaded your webpage and checked the net tab of firebug.
your following urls returned a 404:
http://www.senocakonline.com/Content/font/fontawesome-webfont.woff
http://www.senocakonline.com/Content/font/fontawesome-webfont.ttf
i would assume that those being missing is the reason your icons aren’t displaying.
UPDATE: 23.10.2015
to make it available just add this code to your WebConfig:
<system.webServer>
<staticContent>
<mimeMap fileExtension="woff" mimeType="application/font-woff" />
<mimeMap fileExtension="woff2" mimeType="application/font-woff" />
</staticContent>
</system.webServer>