Most Urls Previews display the Title and then 1 or 2 sentences. Nice clean, and doesn't take too much focus away from the rest of the chat. And there's a way to get rid of the preview if it does become a bit overbearing.
Then there's the ZenDesk one.
The ZenDesk one has:
- A Summary - Ticket from Company name: Ticket #1234
- A Title - The ticket title
- TWELVE LINES of the content of the first comment.
- A Show More link.
It's just too much. It takes up almost an entire screen, and ruins the flow of a conversation.
Just remove the Twelve lines of content completely. Keep the Show More if you want, but the Summary and title are more than enough.