Empty value when I try to extrapolate href

Ok, I wanted to extrapolate social networks link from a Klout page.
Let's take mine: https://klout.com/gianlucaneri
And let's say I want to get the value for the a href of the Twitter icon.

I tried everything, but I always get an empty cell.

Here's what I tried:

=XPathOnUrl("https://klout.com/gianlucaneri";"//a[contains(@href,'twitter')]/@href")
=XPathOnUrl("https://klout.com/gianlucaneri";"//*[@id='main']/div/div[2]/div/div/div/div[2]/ul/li[2]/a/@href")
=XPathOnUrl("https://klout.com/gianlucaneri";"//div/div[2]/div/div/div/div[2]/ul/li[2]/a/@href")
=XPathOnUrl("https://klout.com/gianlucaneri";".//a[starts-with(@href,'https://twitter.com')]/@href")

Can you help me? Thank you very much!

Try this:

=XPathOnUrl("https://klout.com/gianlucaneri";"//a[contains(@href,'twitter')]/";"href")