It is not forbidden to use both of them.
Lemmy for memes and news. US news can be blocked by blicking the communities, users or keywords.
Instagram for local stuff and friends.
(In a ideal world your locals and friends would use Pixelfed or any other fediverse compatible app)






Btw there is a small german lemmy community for posting and requesting product reviews.
[email protected]
I don’t know if something in english exist.