I think it's a great time to jump in.
While user growth is slowing, ad revenues via Facebook/Instagram are still relatively healthy.
I would suspect that trend to continue for the foreseeable future until or unless there is a platform that usurps Instagram.
Between Facebook Messenger, WhatsApp and Instagram, I believe Facebook has user data on ~2.5 billion people.
The company still generates massive revenues and this decline will be short-lived.
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