css - Objects in html not linked -

social media buttons not links though code shows proper linked objects:

<li class="facebook" title="" data-placement="bottom" data-toggle="tooltip" data-original-title="facebook">        <a href="https://www.facebook.com/facebookdevelopers"></a> </li> 

you should read "how ask" page first.

ok so, link it's not outputting noting, because didn't specified nothing inside of outputted, @ least 1 letter should inside of it

<a href="https://www.facebook.com/facebookdevelopers"> </a> 

this output letter link. want linked should inside of <a> tag. example using image link:

<a href="https://www.facebook.com/facebookdevelopers">     <img src="random-image.png" alt="test" height="50" width="100"> </a> 

learn more a tag here