Question with facebook

Two questions:

1. You can limit the amount of text to share via Facebook?, For example, I want to share sentences, but when I get to share the votes, comments, etc., usually happens when the phrase is short.

Two. You can format the text that you share via Facebook?, I want the time to share, the author of the phrase is in bold … Is it possible?

this is my web
https://www.frasescristianas.org