I don't know if it's a technical issue or just a habit some people have but I've noticed a few posters either:
- bold their entire post
- start new lines in the middle of sentences
- add extra blank lines to the end of their post
- include a blank paragraph between every sentence
All of these affect readability. I presume the reason people post if to share their thoughts and have them read so please consider using the best practice of letting the paragraphs wrap themselves (it helps people with a different screen width), using a single 'return' to start a new paragraph and not including extra blank lines (it helps people not have to scroll), limiting bold for emphasis only (it helps people read more easily).