Social media dimentions

Hi,

I have been asked to produce some animated social media memes but I'm not sure of the sizes they should be made at... I looked on google and every post says different things. Would anyone be so kind as to tell me if designing these animations to the following sizes is correct please?

Facebook: 1920 x 1080px

LinkedIn: 1200 x 627px

Twitter: 440 x 220px (This one seems a little small to me and I'm thinking it should be 1024 x 512px)

The animations are intended to be around 26 seconds long at a frame rate of 23:976 and saved as mp4.

Thank you in advance for you help.

All the best,

Christine.