RecurPost allows you to share your updates on multiple platforms. Each platform imposes a limit on how long your posts can be. If you try to post anything longer than that, it will get truncated. Here are the limits that are imposed by each platform.
Twitter: 280 characters
Twitter allows you to share as many as 280 characters. If your post is longer than that you will see an error in the History on the Dashboard page.
Twitter treats links differently. There is a myth that short links let you fit more characters. However, each link is 23 characters long regardless of how many letters are there in the link. Twitter is considering changing this. When that happens we will change our algorithms too.
Facebook Profiles: 5000 characters
Facebook Pages: 5000 characters
Facebook Groups: 5000 characters
LinkedIn Profiles: 3000 characters
LinkedIn Company Pages: 3000 characters
Google My Business: 1500 characters
Instagram: 2200 characters
Pinterest: 100 characters (in Title) and 500 characters (in Description)