The Internet Is Real
I am aware that I have some very strong opinions - particularly on religion and religious violence. With these topics I am especially careful because:
1) I have some religious friends (those tolerant and lovely enough to see past my militant atheism)
2) Speaking ill of religion can get you into hot water.
I have decided that I can afford to be a bit more lax with what I write about online because I am not going to be seeking formal employment after I graduate, but I will be very concerned if my business fails and I have to go and re-evaluate all my social media channels. I will have to make them employer friendly. Not everyone is that lucky - many of my peers have started employee proofing their social networks, so I count my blessings.
Writing something online makes it no less tangible than if you said it in reality - quite the opposite. Everything online has a footprint and no company deletes anything indefinitely. One has to be able to rationally explain and defend what one writes online, or then not be bitter about a backlash when they can't or won't.
Being present and vocal online is an important part of many careers: journalism, marketing, PR, fashion, the arts etc. But there's a marked difference between quirkiness and being downright offensive: it's up to you to filter your blog to what you deem is appropriate and tasteful enough to be controversial but interesting, without crossing over into the ignorant.
To reiterate - the internet is real- and can be used against you just as much as it can work in your favour.