To post on Twitter from Plezi:
If you post a message containing only a link, it will appear as follows on Twitter. A preview of the page associated with the link will be automatically created by Twitter. This is based on the Open Graph data of your page.
If, in addition to the link, you add an image to your post, it will appear as follows. The preview of the article will be replaced by the photo associated with your post. It is possible to add several pictures to your post.
Good to know!
Twitter does not allow you to link to an image;
You can choose an image in GIF format;
You can tag people on Twitter in a post: you just need to get their @ (= twitter nickname).
On Twitter, no preview is possible: you have to post to see the result; My advice? Have a "test" account that no one else has access to.