The simple Like button fails to validate the fb module installation

My first and simplest step in using the fb module failed.
I start with trying to insert a Like button in a block, which block I want to insert in a panel. If I follow your procedure: install the fb module/create the block in Full html with <fb:like></fb:like> in body/insert it in the panel. Nothing shows-up.
Instead, when I create the block's body with the standard Facebook code (even a bit more complex than in the fb module test): <div class="fb-like" data-send="true" data-width="450" data-show-faces="true"></div>, I get the correct rendering of the button.
So, the documentation needs an update (i.e. just tell the people to use the latest Facebook code)?

Drupal has something called

Drupal has something called an "input filter". You're block is probably using the default one, which is stripping the fb:like tag. Try the PHP input filter (the full html filter in D7 is buggy).

Look up input filters on drupal.org for details.

Further info

Just to add some further info for next person who comes along.

This new format is the HTML5 way and you can get a good head start from here: https://developers.facebook.com/docs/plugins/