I joined twitter on 20th February 2009, three and a half years ago. At the time I was very skeptical; I had no idea of the effect twitter would have on my professional life or the wealth of contacts I would build up in my Personal Learing Network (PLN). Being a shy individual, an introvert in fact, I felt uncomfortable about using my own photograph for my profile image, so I chose an image that represented me: a cup of coffee. I do like good coffee, and sometimes tweet about it. The image certainly said something about me, as a person. I also felt somewhat protected, lurking on twitter, hiding behind my avatar, thinking I was unnoticed, anonymous in some way. The cup of coffee lasted for about 6 months, until I met @vonprond at a conference in Galway. In fact, Ferdinand was the first person I followed on twitter. He commented that I looked completely unlike my image: he'd been expecting a large cup of coffee. I realised that my perceived anonymity did not exist an...