I write for magazines - mainly about crafts and history - and have a book coming out very soon and another book I have been involved in, which is a re-issue of a classic book, very well known in its field, also due out very soon. I didn't have to pitch the book or ask to get involved in the new edition of the other book - the editor of a magazine I used to write for, set up her own indie publishing company, (successful) and approached me with a book deal.
FB I keep for my friends and family and real life people. Twitter is my work name.
I write articles all the time, and usually for the same magazines - a small but growing number. Most of the mags I write for are American. Just happened that way. They are a bigger market - and I used to live in the States so can write in a way they like, maybe. I don't formally pitch any more, but will ask editors I already have worked for, if they want so and so, and they will say yes or no. Or no, not that but we need something on.... whatever. Also, after a while you get included in the little private circular emails/mood boards that go out to writers they know and trust - so say Fall, 2013 we are doing a themed issue on x theme... submit your ideas. So you get on an inside track and have that advantage of them telling you what they want. It is harder for newer writers as they have to break into that inner sanctum kinda thing - and also when pitching they won't know what an editor is looking for (more and more of the mags I write for have themed issues). I can write a very informal suggestion, barely a pitch at all, and hit send and have an email back in ten minutes commissioning.
I wrote for little or no money for a long time, and I originally worked with a (brilliant) illustrator - so if they wanted her images they had to take my text.
But my publisher spotted me posting on a forum, believe it or not. To do with one of my areas of expertise.
I travel round to research. This costs me money. But I can turn 4 hours in an archive (sometimes less) into one or two articles. My work is research heavy. And I tend to try to publish stuff no-one else has done before, so corner a fairly quirky market.