Meta Ads offer excellent targeting based on interests and behavior. Test different audiences with variations, use short video creatives, and keep text minimal. Retarget visitors who interacted with your content but didn’t convert. Lookalike audiences can scale campaigns fast once you find a winning combination.
I haven't ran advertising on Instagram but I have done it multiple times on Facebook. However, these ads were mostly related to products, I haven't advertised websites directly.
I haven't done this myself, but I've thought about doing this for my Youtube channel over my forums. I feel like if I promoted my forums I wouldn't get new members I would just get possibly bots visiting my forum, browsing it and that's it.
I haven't used either. However, one of my goals is to get my Facebook page into the monetization program, so I can start earning revenue from ads on Facebook.