On Fakebook, a link to Peakd shows no thumbnail, but at this point a link to www.proofofbrain.blog displays in full with the thumbnail.

Does this mean Facebook doesn't block any of these links?

Posting content on the Hive blockchain is another way to keep it available online.

I have been banking on this for a long while. it is one of the reasons I am growing my account, so that in the nearest future, I'll be using my account to share businesses I will be venturing into outside hive.

The beautiful thing is that it will always be available online as you said, and with the right keywords and phrases, a wider audience will get to find it.