My personal web presence is split across two domains.

example.co.uk is a blog, originally intended to be purely personal, covering my thoughts on whatever - politics, religion, business, and some particular passions, lets call one "gadget info and advocacy" (not a huge amount of content) and the other "whatsitology" (lots of content) in deference to WW rules.

I also have example.net which is a (business) profile site - i.e. a page or two about how brilliant I am and a few sharing my great thoughts with the world.

example.co.uk has a lot more content, traffic and links. It has always been a blog and the structure up to the top level is pretty much typical of a blog.

I also have two other domains, one all about widgets and one which is a site for my business (example.net links to this). I see no reason to change this.

I am currently thinking of doing the following:

1. launching a separate site for "gadget info and advocacy". This may turn out to be profit making if it succeeds, but I do not really care - I am doing it primarily because it is a cause. It has some political links ("our right to gadgets") but is primarily information and education and the political angle is not a topic society at large cares about .
2. launching another site to share my great thoughts on whatsitology - this is an intrinsically controversial/politicised subject. This is also a platform to reach a greater audience, and possibly yet another new career.

So both these blur the boundaries between business and personal. particularly as what I think on these things may have repercussions (possibly negative, but I think overall reputation building will be positive) for my existing business too.

Now the question is, what content I should put where.

I think "gadget info and advocacy" has a lot of content (guides, howtos, opinion pieces, links to gadget related services) that requires a separate site. I would ideally like to have a lot of UGC there (one reason I am doing it is that the best current sources of info, such as a gadget wiki, are not fit for purpose - good content let down by being on the wrong system). So it needs to be on a separate domain.

The whatsitology content is not so obviously one to put on another domain. Its very much my opinions, but in a much more extended form than the blog - an online book or books is more the aim. Very likely available as an ebook too. So its very much authored by me and associated with me.

What I cannot decide:

1. Whether to merge my blog and profile page into one, and which domain to use if I do.
2. Whether to blog about all the subjects (business, whatsitology, gadgets etc.) on the same domain. The ccTLD matters a bit because gadget related content is often/largely country specific.
3. if I do merge the sites whether to change the paths of existing content (neater to say move everything to /blog) or try to work the new content around the existing (the paths are /yyyy/mm/nnnn and /categories/nnn and so on so easy to separate, but also easy to redirect).

The reason for 2. is that I have tried blogging on two of my other sites, and the posts are not read very much. It also means I have do decide whether, for example, a business related posted should go on example.net, or the company site, or example.co.uk. This will only get worse as the boundaries become blurred.