Browsing online isn’t like reading a book, but is more like scanning a newspaper. Most newspapers (yes, they still exist) have short paragraphs because they’re easier to skim through without losing your place.
Online copy tends to be consumed in the same way. Most of it is free, so is often attracting an uncommitted readership. A simple format is therefore a key to holding people’s attention.
This means short paragraphs of no more than two or three sentences.
For proof of this, check the comments section of your favourite online forum. Remarks that are written in huge blocks of unrelieved type tend to be ignored.
Comments displayed in short paragraphs are the ones that get attention. So press Enter to make your copy friendly!