For the first option:
A pop-up link will display both Facebook and blogger comments but will hide the Blogger comment form as shown below, SEE DEMO ALSO
To do this go to Blogger > Settings > Comments and in the comment form placement option choose the pop-up option as shown below,
Save and you are done!
For The Second Option:
If you wish to hide both blogger comments and the comment box? In that case, set comments to hide
As mentioned by Blogger Hiding the comments will not delete them but temporarily hide them from visitors.
Hit save and you are done again!
What to Do Hide or Popup the form?
The best SEO and productive advise that I can give is that you may hide the Blogger comment box only but you must display blogger comments and give users the chance to comment with any platform they may like. In short the popup option is the best. Blogger comments are crawled by search engines and they are an important part of your content so its better that you don't hide them.
With coming days I will come up with more tweaks related to this brilliant traffic gifting Facebook plugin and will try to make it more blending with some customization tips.
You must know: