I also had no idea what it was meant to do from the tagline - at least say social network or something. It was not at all obvious that you could roll over those

I also had no idea what it was meant to do from the tagline - at least say social network or something. It was not at all obvious that you could roll over those pictures - they need to look more clickable. Like others on this thread, I didn't spot the Sample Network link at all until it was pointed out. I will often watch a screencasts on the front page of an unfamiliar website if I can't figure out what it does - maybe that is worth trying?