A social timeline plugin such as the jQuery social timeline plugin at first seems cute - it's transitions are slick and it might initially seem like a nice easy way to amalgamate disparate information.
However, therein lies the problem: that disparate information is distributed for a reason.
Each social media network enters the market with a new and different USP. They serve different markets, different demographics. They provide different content, appeal to different emotions and different attitudes.
When you interact with different networks, you do so in a way that aligns with the sentiment of that network, and you share with like minded individuals - probably a different set of friends and for different motives than you would on another network.
Twitter, Facebook, Google+, MySpace, whether you like it or not you adapt the way you interact to fit the environment and the rules - just the same as you would in a physical environment: at home, at work, at play.
Which leads me to my point - that when you publish content you should consider whether it's fit for purpose - which means understanding that purpose.
Trying to re-centralise that distributed data from different environments results in a mish-mash of different types of content, written in different styles for different audiences and different purposes.
Doing this for portfolio reasons is, I believe, more likely to undermine what you set out to achieve with a portfolio.
A portfolio should be a carefully curated set of content, each item targeting your intended audience, each item in balance with the next, and the whole being more than the sum of the parts: the picture of you that you want to convey to potential clients and employers.
I don't believe that a social timeline can achieve what you should be seeking to do with a portfolio, how ever much the settings let you choose the sources and filter unwanted content.
By all means link to suitable examples of your work, but For a portfolio it's more important than ever to speak to your audience. Portfolio viewers will be looking at many many portfolios, online or on paper. They don't want to have to work at finding out what's important. Those who view your portfolio will be wanting you to write for them - not wanting you to redirect a bunch of stuff you wrote for others.
Without that single minded targeting of your intended audience you won't bring clarity, and your readers won't get you.