Was looking at copywriting examples and ended up visiting login pages of a few sites we rarely visit anymore since auto-login.
For most, the copy is simple and to the point (how it should be). They tell you what's in it for you and that's it. No cute stuff.

1/

Facebook - Facebook helps you connect and share with the people in your life

Answers the Q in your mind about what you can do with FB. They obvi do a lot more but they stick to their essence (connecting & sharing) without complicating matters (like they did with the product)

2/

Whatsapp
Simple. Secure. Reliable messaging.

Looks like the stress is more on 'we are about trust' than 'we are about messaging' (with the words 'secure' and 'reliable')

3/

Twitter
See what’s happening in the world right now

Apart from Twitter being my favorite social product, it also bags my favorite copy award.

4/

Instagram - *nothing*
This was interesting. I don't know the reason behind why Insta chose not to keep any copy. Maybe their phone screenshots do the talking since they are about pics?

5/

Reddit - The front page of the internet

Felt this was a bit cute. Or maybe I am missing a cultural reference. Not exactly hitting the nail on 'what does Reddit do for me'. Liked the second sentence more "Reddit is a network of communities based on people's interests."

6/

Linkedin - Welcome to your professional community

Again, felt this was a bit too high level. Could have included some action verbs around what I can do on Linkedin. Any reason why they went with this?

7/

Notion - All-in-one workspace

Loved this. Exactly communicates what problem Notion will solve for me (ie, all my important stuff is scattered everywhere)

8/