Do people want to see produced work or just news articles and links from blogs?
I dont want to post memes or pictures of cats I feel memes should be part of the comments to a post rather than a post itself.
I'm reasonably capable of finding things that interest me, that provoke thought. I'm not capable of forming opinions and observations outside my own experience. So I share things that make me think because I want to know what other people think. I share things I disagree with because I want to see if others agree with me or if I haven't fully considered them. I share things I want to know more about in hopes that somebody else will add more to the conversation. And I share things that I specifically know others will like, because in sharing those things I enrich the environment we have in common and encourage them to do the same as a result. "What kind of things should I post" is an entirely appropriate thing to share. It asks a question. It encourages conversation. To answer your question specifically from my viewpoint, I don't follow tumblr, the only people I follow on twitter are al-shabab and Rupert Murdoch, and I haven't logged into G+ in weeks. I want to see anything that someone else found thought-provoking - even if my reaction is to shout it down (I usually vote for things that actually required me to formulate a response, unless that response is a long-winded elaboration of "this article is stupid"). Memes and cat pics do not interest me in the slightest. But that's just me. You may find a devoted audience who loves the cat pics you share. If cat pics are your passion, share them. You are likely to find others who share that passion with you. Clearly there's a market for Philip J Fry image macros, I just don't happen to be a part of it. Don't worry about what's important to me, worry about what's important to you.
So if you want many people in the community to take interest in you, memes would probably be the wrong way to go, most post written articles/videos that have depth to them. However, no one will stop you if you wish to do so. If anything else, posting cats will probably be a good way to test hubski's new ignore feature, but I wouldn't count on it to help you integrate with the community.
Style-wise, you can post most anything you want. Feel free to post either links, or even construct posts as blog posts. Or a combination of the two. Sometimes I just post a link, sometimes I just post some thoughts I have. You can go so far as to treat Hubski as a blog if you like. For example, image links embed, so you can have text and images with no link (here I just posted a painting I made: http://hubski.com/pub?id=11830). I encourage people to get creative. People can follow you, or not, or they can even actively ignore your posts if they don't want to see them. For example, if you wanted to post cat pics, you might get a bunch of ignores, but some might follow you. It's pretty open-ended.
Hubski is of course a community, and so will have many internal voices and struggles as to what makes appropriate posting. I'm sure there are those who would enjoy cheap funny images (I do myself sometimes, but not here). And they will speak as I have spoken, and that is the way it should be.
There are no strict rules for what you can and can't post to Hubski. However, the best Hubski posts contain ideas, information, and perspectives that we haven't encountered before.
Posts of personal content are fine, especially if you have something interesting or creative to share. Feel free to share personal insights and experiences with us. Of course, spamming won't be tolerated. I tend to keep it simple, if I see a video or a photograph that I enjoy, I'll post it. If I read an article I enjoy, I'll post it. I often share my own thoughts or creations as a post too. There really are no strict rules. As mentioned if it's fluff it will likely not gain traction. So post whatever interests you, it's likely to interest others too. Also, welcome!!