Each social network Missinglettr supports has its own limits when posting content to their API.
At the moment, the character limits within Missinglettr are:
Twitter: 280
Facebook: 1000
LinkedIn: 3000
Instagram: 1000
Google My Business : 400
When you’re drafting a post, the remaining characters will be displayed in the top right corner. You won’t be able to schedule a post if it exceeds that platform’s limits.
Further Reading