Can I interchange 'on' with 'in' in the sentence?
(On, in) his Facebook post, Jonathan expressed his gratefulness for being raised in a loving family.
Only "in" sounds natural in your sentence. It would be "on" his Facebook page , though.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
Only "in" sounds natural in your sentence. It would be "on" his Facebook page, though.