The first thing you should take into account is that you can post all four types of posts on Facebook: Text, Image, Video, and Link. For Stories, only Image-type posts can be published.
Also keep in mind that your posts can have up to 63,206 characters and you can add up to 140 images per post for Pages, and single-image posts only for Groups.
For Link posts, Facebook will always read the URL and retrieve its information such as photo, description, title, and subtitle at the moment the post gets posted. This information cannot be edited. You’ll see a preview of the URL on Postcron, but given that Facebook will read it again there might be a few differences between what you see on Postcron and on Facebook.
It’s recommended that you follow all Facebook policies and best practices when posting either directly on Facebook or via Postcron. You can find their Community Standards here.
Sum up
Text Posts: Yes
Max. characters: 63,206
Hashtag Limit: No
Image Posts: Yes (Stories on Pages only)
Multi-Image Posts: Yes (Pages only)
Max. Images per post: 140 (Pages)
Link Posts: Yes
Link Editing: No
Video Posts: Yes
Mentions: Yes (Pages only)