It is essential to review posts for spelling and grammatical mistakes before publishing them. In addition to scanning for errors, a full review will help you identify (and include) 'points' which you might have missed out on while creating the draft.
4. Overwhelming the audience with advertisements
Advertisements are a necessary evil that help a site survive. However some bloggers are so obsessed with earning quick money from their blogging endeavours, that they overwhelm their audience with advertisements - the result being that they (the suffering visitors) leave the site never to return.