The plan for other social media is below. Note that I previously used Erato and Timberwolf's entries for entry reminder posts on Discord and Reddit so to be fair I'll use the other entries for illustrations.

Reddit:

Post Chrnan6710's screenshot as a photo post, then add a comment:

Did you know that the savegame which plays behind the main menu of OpenTTD is created and selected by the community?

As we approach the release of OpenTTD 1.11.0, it's time to select the next title screen. Entries were open for four weeks on TT-Forums and we received five entries from Erato, Timberwolf, didac, Emperor Jake, and Chrnan6710 (pictured here).

To vote, head over to GitHub [note: insert link here once the voting thread is created]. You'll need a GitHub account (free). The deadline is Sunday, March 28, 2021, at 23:59:00 UTC.

Discord:

I will ask one of the staff to post didac's entry and the following text in #announcements. Short posts are best for Discord:

Voting is now open for the 1.11 title game, which plays behind the main menu of OpenTTD. Head over to GitHub to cast your vote by March 28! [link]

TT-Forums:

I will update the root post and add another post to make the thread unread. No image needed.

Voting is now open for the 1.11 title game, which plays behind the main menu of OpenTTD. See the top post in this thread for details. Head over to GitHub to cast your vote by March 28! [link]

Twitter:

I don't have (or want) access, so @TrueBrain can handle this. :D I suggest using Emperor Jake's entry and the following text:

Voting is now open for the 1.11 title game, which plays behind the main menu of OpenTTD. Head over to GitHub to cast your vote by March 28! [link]