Can you have many online identities?

It’s a question that has started to have real-life implications. Can you have a business persona that is staid and serious and full of nothing other than information about the job you do, as well as a personal persona that is filled with music, art, and the things you do in your spare time?
Where is the boundary? Job-seekers today are already aware that potential employers will scan for their details using Facebook and Google, but how do you deal with multiple personalities on a day to day basis?
Many Twitter users ensure that their account profile features the line ‘these are all personal tweets and don’t reflect the views of my employer’. It’s a kind of get-out clause, but most of their tweets will be about the industry they work in, unless they are tweeting at the weekend and in the evening.
But my Twitter feed automatically updates my LinkedIn status. Yesterday someone sent me an email saying that he feels I have too much information on my LinkedIn profile that is not related to ‘business’ – because the status is featuring my Twitter conversations.
I could sit back and worry about this. Perhaps divide my life more effectively and only ever write about IT on LinkedIn and only ever talk about music on Twitter, but I don’t live my life like that – I can be thinking about technology, or politics, or sport, or music at any time of the day and on any day of the week, and my Twitter stream reflects that broad set of interests and debates.
So I don’t think I can divide up my own life into neat chunks of business and personal time – which is also harder for me because I don’t work for a big company. It’s just me.
So what did I do? I deleted him from my LinkedIn friends list! Now he won’t see any more tiresome updates from me. Or have access to any of my network. Or hear about the things I am doing that might interest him. Who loses most?

Westfield, Shepherd's Bush