This is very easily achieve through the Settings facility of the Yola blog. The "Like<=>Recommend" title is selectable from within the next facility by selecting one of the two verbs: Like or Recommend
It requires collecting the Code from Facebook and then Pasting it back into the Settings of the blog.
- Go to the Facebook page Like

Don't add a URL to the "URL to Like" field. leave this blank. Any other fields are configurable.
2. Click the "Get Code" button and you will see the next screen:

3. ...
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