Sarcasm is very useful, but it can sometime be hard to work out if someone is being sarcastic if,
1, You don’t know the person very well.
2, Can’t see their face to interpret their facial and tonal expressions.
3, Both of the above due to them writing a blog.
It’s handy that blogs have sarcasm tags that clearly explain when people are being sarcastic.
Please take note to use them or at least explain that you are being sarcastic.