WhatsApp is not fine – a lot of times, there are no links to content, the videos you get in there are taken out of context (you don’t know the author, you can’t see additional details), you don’t know who originally put a certain picture online (there’s no author).
On Facebook – you don’t have a reverse image search – again, you can’t search.
Facebook’s groups are annoying me, everything is lost in a few days, for active groups.
In a month, you won’t find anything from the past.
You post something today, some people will view it in the following hours, in a matter of days you might get some additional views, and that’s it.
Searching on Facebook is rarely used.